Determine best number of swaps and trials for Simple Substitution Cipher

[CameronLonsdale]

The current hardcoded solution takes too long for examples which can be cracked with only 2 trials. I need to come up with a way to estimate what the best settings are for a given ciphertext. This might be a job for torched (or whatever I'm calling the CLI) I could look at ciphertext length for this metric.