Do you have a wideband in the car? If not, then you're flying blind. The mods you're tuning for are pretty simple, you might want to consider hiring...
Oic. I'd assume the old tune disabled cat heating to prevent it from going into cat heating mode, and now cat heating is working it's trying to heat...
So, I cranked the Startup airflow to abnormal levels and decreased the Cranking Ve to 60%, which I have never needed to do, but that is what get's it...