G'day & Welcome.
I've got a P3 in my Cruiser, must get around to looking at the setup video though, as I find it doesn't brake hard enough when loaded but will go to max ppower when the trailer is unloaded.
Jules, if you aren't aware of it already, check the boost setting as this helped me. I used to have it on the B2 setting (as the pic showed a 4wd and ct/caravan!) but now have it on No Boost. Apparently the boost setting up's the initial voltage when the brakes are applied (and then proportionally increases them with the weight of your foot! ie how hard you're braking). I also had to change (increase) the volt setting to compensate for no boost. The manual says start on 6v, but I think its set at 9-10v now.
Then again all that could be just dumb luck, and the brakes have finally bedded in!!!
I too should probably read the instructions in full.
LJ