You don't need to worry about the rear, that just slides around with no real weight on in (if you're doing it right). Why have you got camber on the rear out of interest?? Are we talking a lot??
I run oddly high pressure to keep the carcass stable, seems to do the trick, about 34 cold... but, I have a RWD car, so you may have to experiment, as you're asking different things of them on a FWD car.