You must have arms like popeye to have 7 degrees positive caster. Power steering has three and we know how hard it becomes when the engine stalls. I have set drag cars with 5d and they track like arrows but steer like dogs. Positive camber loads the larger inner bearing and carries weight on inner end of spindle, while negative camber enhances turn in it changes load to outer brg and end of spindle and makes steering effort harder again. positive camber is designed to go o under load, if you set much negative in it becomes a tyre wearing issue by increasing neg camber under loads. Pure race cars have totally different suspension and bearings than road cars.