Nick, when you say you arent happy with the feel of it, what is it you dont like?
Myself and Rich both have power steering in ours, and the only complaint i have with mine is the lack of self centering, this i am working on though.
My front tyres are lower than 20, around 18 iirc. Definately makes a big difference.
If yours is too heavy maybe try 25?
AS for camber, im running 0, and a tiny amount of toe in. But running maximum caster, cant remember what it equates to, but there is no adjustment left to get more on unless i change one of the wishbones.