Please tell me that you can still un-remove that PC. A Monster XL with one PC is just like any 2500, 2000, Monster, while trying to put two PC's on a CPS 2500, 2000, Monster.... that's not happening, ever. You can do a lot of things to a Monster XL but at some point you must look at it for what it is, and use it accordingly. Or else it might as well just be any old Monster/CPS gun that you have hacked apart.
Still, in the quest for knowledge, many things must be done. I'm interested to see how that works.
Reducing the MXL from two nozzles to one, that's just awesome, by the way. You should get 3-4 seconds of shot time on the largest nozzle! And as far as replacing the res with a backpack, that's cool too, IMHO.
Wish I had a MXL to play with...