Interesting thing I noticed today while logging, cruise BLM were pretty close to what I wanted but after I filled up the gas tank and they all went rich.
I've fitted a CCP solenoid to my RamJet intake and I'm guessing the CCP solenoid was pulling more than just vapours, I took it for a run out on the motorway to confirm and by the time I got back it looked to have settled down.
I think that you can safely ignore the data right after a refueling event. This is normal, provided your charcoal canister is functioning properly and you are not getting any raw gas into it, or topping off the fuel level after auto shut off of the gas nozzle. You can turn off the canister purge valve until 1200 RPM, this will disable it at idle and only allow it operate and higher airflows.