I never had a bump steer issue and front of my car was lower than most...I had bump stop issues, but not bump steer...
My car had Stock swaybars, all stock suspension arms, bilstein suspension...camber 3 and 1.5 just from lowering, toe set pretty much neutral, I think 1 degree of caster..17 x8,9 and 245/40, 255/40 tyres...It always handled great and exceeded my expectations..I know some people are doing quick laptimes with much the same setup too but better brakes and bigger balls...
my next step was sways bars and some extra caster, but I didnt see the need to do much more to it, it was simple and it worked...Not to stiff, not too soft..
The new owner said he has some issues with the front being too low, because he lives in the bush and has crappy roads though..guess it depends where you drive most and how good the roads you drive on are...But on the track and around Melbourne I never had an issue and my crossmemebr was maybe 120mm off the ground...I know it was just above legal height anyway..