Welcome ScaryGroove . . .
It is a bit overwhelming with all the choices available in the KPA plus all the profile for sale but it s a great thing to have so many options. I tried to do/try too much at first and went a bit nuts in the process. Now I'm just finding a few profiles that I like and go from there. Having the remote is great, also.
As far as guitar cabs or FRFR goes, use your ears, it's what I did. I found I prefer FRFR for the KPA. I was using Yamaha DBR 10 PA speakers with a 12" sub but have swapped them out for a Friedman ASM 12 and to me, at least, there is a world of difference in tone and feel which I like.
Use the Force, Luke.
Enjoy the Ride .