this is how I use mine
I’ve set the KPA to 4 slots per performance then have a clean, crunch, rhythm & lead channels.
The top four switches are then used for distortion (B), pre-amp Modulation (C), post amp Modulation (Mod) and Delay.
It works well for this type of application.
I can't get the cust1 or cust2 to go above 9 banks. Honestly I'd be happier without any banks and being able to just send a performance slot change and a stomp change, but it seems that's not possible.