diff --git a/flow/designs/asap7/jpeg_lvt/rules-base.json b/flow/designs/asap7/jpeg_lvt/rules-base.json
index 5304309a43..b888168d47 100644
--- a/flow/designs/asap7/jpeg_lvt/rules-base.json
+++ b/flow/designs/asap7/jpeg_lvt/rules-base.json
@@ -52,7 +52,7 @@
         "compare": ">="
     },
     "globalroute__timing__setup__tns": {
-        "value": -120.0,
+        "value": -277.0,
         "compare": ">="
     },
     "globalroute__timing__hold__ws": {
diff --git a/flow/designs/asap7/mock-alu/rules-base.json b/flow/designs/asap7/mock-alu/rules-base.json
index b2a7eeaa9f..0311845814 100644
--- a/flow/designs/asap7/mock-alu/rules-base.json
+++ b/flow/designs/asap7/mock-alu/rules-base.json
@@ -28,7 +28,7 @@
         "compare": "<="
     },
     "cts__timing__setup__ws": {
-        "value": -278.0,
+        "value": -310.0,
         "compare": ">="
     },
     "cts__timing__setup__tns": {
@@ -48,7 +48,7 @@
         "compare": "<="
     },
     "globalroute__timing__setup__ws": {
-        "value": -295.0,
+        "value": -320.0,
         "compare": ">="
     },
     "globalroute__timing__setup__tns": {
@@ -80,11 +80,11 @@
         "compare": "<="
     },
     "finish__timing__setup__ws": {
-        "value": -271.0,
+        "value": -306.0,
         "compare": ">="
     },
     "finish__timing__setup__tns": {
-        "value": -17200.0,
+        "value": -17500.0,
         "compare": ">="
     },
     "finish__timing__hold__ws": {
diff --git a/flow/designs/asap7/uart/rules-base.json b/flow/designs/asap7/uart/rules-base.json
index 256594da79..667777b4e6 100644
--- a/flow/designs/asap7/uart/rules-base.json
+++ b/flow/designs/asap7/uart/rules-base.json
@@ -28,11 +28,11 @@
         "compare": "<="
     },
     "cts__timing__setup__ws": {
-        "value": -36.3,
+        "value": -55.2,
         "compare": ">="
     },
     "cts__timing__setup__tns": {
-        "value": -783.0,
+        "value": -1920.0,
         "compare": ">="
     },
     "cts__timing__hold__ws": {
@@ -48,11 +48,11 @@
         "compare": "<="
     },
     "globalroute__timing__setup__ws": {
-        "value": -48.7,
+        "value": -64.4,
         "compare": ">="
     },
     "globalroute__timing__setup__tns": {
-        "value": -1510.0,
+        "value": -2680.0,
         "compare": ">="
     },
     "globalroute__timing__hold__ws": {
@@ -80,11 +80,11 @@
         "compare": "<="
     },
     "finish__timing__setup__ws": {
-        "value": -37.8,
+        "value": -54.0,
         "compare": ">="
     },
     "finish__timing__setup__tns": {
-        "value": -840.0,
+        "value": -1860.0,
         "compare": ">="
     },
     "finish__timing__hold__ws": {
diff --git a/flow/designs/nangate45/bp_be_top/rules-base.json b/flow/designs/nangate45/bp_be_top/rules-base.json
index 1ff3e01973..a7c912ab0c 100644
--- a/flow/designs/nangate45/bp_be_top/rules-base.json
+++ b/flow/designs/nangate45/bp_be_top/rules-base.json
@@ -32,7 +32,7 @@
         "compare": ">="
     },
     "cts__timing__setup__tns": {
-        "value": -19.8,
+        "value": -26.0,
         "compare": ">="
     },
     "cts__timing__hold__ws": {
@@ -52,7 +52,7 @@
         "compare": ">="
     },
     "globalroute__timing__setup__tns": {
-        "value": -23.8,
+        "value": -31.0,
         "compare": ">="
     },
     "globalroute__timing__hold__ws": {
@@ -84,7 +84,7 @@
         "compare": ">="
     },
     "finish__timing__setup__tns": {
-        "value": -24.4,
+        "value": -29.1,
         "compare": ">="
     },
     "finish__timing__hold__ws": {
diff --git a/flow/designs/nangate45/ibex/rules-base.json b/flow/designs/nangate45/ibex/rules-base.json
index a0a7b9c806..bc10d84126 100644
--- a/flow/designs/nangate45/ibex/rules-base.json
+++ b/flow/designs/nangate45/ibex/rules-base.json
@@ -52,7 +52,7 @@
         "compare": ">="
     },
     "globalroute__timing__setup__tns": {
-        "value": -0.443,
+        "value": -1.69,
         "compare": ">="
     },
     "globalroute__timing__hold__ws": {
diff --git a/flow/designs/nangate45/jpeg/rules-base.json b/flow/designs/nangate45/jpeg/rules-base.json
index 77ce68793d..3ffe98ca42 100644
--- a/flow/designs/nangate45/jpeg/rules-base.json
+++ b/flow/designs/nangate45/jpeg/rules-base.json
@@ -32,7 +32,7 @@
         "compare": ">="
     },
     "cts__timing__setup__tns": {
-        "value": -36.4,
+        "value": -37.0,
         "compare": ">="
     },
     "cts__timing__hold__ws": {
diff --git a/flow/designs/sky130hd/jpeg/rules-base.json b/flow/designs/sky130hd/jpeg/rules-base.json
index beaa90b067..42387f2c06 100644
--- a/flow/designs/sky130hd/jpeg/rules-base.json
+++ b/flow/designs/sky130hd/jpeg/rules-base.json
@@ -44,7 +44,7 @@
         "compare": ">="
     },
     "globalroute__antenna_diodes_count": {
-        "value": 102,
+        "value": 163,
         "compare": "<="
     },
     "globalroute__timing__setup__ws": {
diff --git a/flow/designs/sky130hd/microwatt/rules-base.json b/flow/designs/sky130hd/microwatt/rules-base.json
index 5975158f30..ae784a91fc 100644
--- a/flow/designs/sky130hd/microwatt/rules-base.json
+++ b/flow/designs/sky130hd/microwatt/rules-base.json
@@ -72,7 +72,7 @@
         "compare": "<="
     },
     "detailedroute__antenna__violating__nets": {
-        "value": 0,
+        "value": 1,
         "compare": "<="
     },
     "detailedroute__antenna_diodes_count": {
diff --git a/flow/designs/sky130hs/ibex/rules-base.json b/flow/designs/sky130hs/ibex/rules-base.json
index 642d4a3325..89211da5e2 100644
--- a/flow/designs/sky130hs/ibex/rules-base.json
+++ b/flow/designs/sky130hs/ibex/rules-base.json
@@ -32,7 +32,7 @@
         "compare": ">="
     },
     "cts__timing__setup__tns": {
-        "value": -1.42,
+        "value": -2.9,
         "compare": ">="
     },
     "cts__timing__hold__ws": {
@@ -52,7 +52,7 @@
         "compare": ">="
     },
     "globalroute__timing__setup__tns": {
-        "value": -54.1,
+        "value": -140.0,
         "compare": ">="
     },
     "globalroute__timing__hold__ws": {
@@ -84,7 +84,7 @@
         "compare": ">="
     },
     "finish__timing__setup__tns": {
-        "value": -2.86,
+        "value": -33.4,
         "compare": ">="
     },
     "finish__timing__hold__ws": {
diff --git a/flow/designs/sky130hs/riscv32i/rules-base.json b/flow/designs/sky130hs/riscv32i/rules-base.json
index 3605a7cd10..4f3963bdda 100644
--- a/flow/designs/sky130hs/riscv32i/rules-base.json
+++ b/flow/designs/sky130hs/riscv32i/rules-base.json
@@ -52,7 +52,7 @@
         "compare": ">="
     },
     "globalroute__timing__setup__tns": {
-        "value": -10.1,
+        "value": -11.1,
         "compare": ">="
     },
     "globalroute__timing__hold__ws": {
diff --git a/flow/scripts/synth.tcl b/flow/scripts/synth.tcl
index 0af28bd055..9864dbe281 100644
--- a/flow/scripts/synth.tcl
+++ b/flow/scripts/synth.tcl
@@ -34,6 +34,9 @@ proc get_dfflegalize_args { file_path } {
 source $::env(SCRIPTS_DIR)/synth_preamble.tcl
 read_checkpoint $::env(RESULTS_DIR)/1_1_yosys_canonicalize.rtlil
 
+# Read in standard cell definitions before checking hierarchy.
+source $::env(SCRIPTS_DIR)/synth_stdcells.tcl
+
 hierarchy -check -top $::env(DESIGN_NAME)
 
 if { $::env(SYNTH_GUT) } {
diff --git a/flow/scripts/synth_canonicalize.tcl b/flow/scripts/synth_canonicalize.tcl
index 4ba62a4523..1b04a2c443 100644
--- a/flow/scripts/synth_canonicalize.tcl
+++ b/flow/scripts/synth_canonicalize.tcl
@@ -12,5 +12,9 @@ if { $::env(SYNTH_REPEATABLE_BUILD) } {
   setattr -unset src *
   setattr -mod -unset src *
 }
+
+# Strip away standard cell definitions to make the checkpoint smaller.
+delete =A:\liberty_cell=1
+
 # The hash of this file will not change if files not part of synthesis do not change
 write_rtlil $::env(RESULTS_DIR)/1_1_yosys_canonicalize.rtlil