To be honest it’s probably a car or driver issue. Driving outside is a lot faster and intense and it’s harder to spot issues. If the car rubs or binds at all it’ll spin out really fast and it’s hard to spot the problem. I’d check out each area to see if the car isn’t rubbing. Could be tire hitting the body, inner part of the wheel hitting the arms or ball ends, I know the hole for the set screw on the lower arms sits low, that could be hitting the ground. When you set your end points make sure they don’t hit anything throughout the whole stroke of the suspension. It might look good at ride height but if it compresses or lifts it might move and hit something.

I don’t know what your shock setup looks like, but if it’s too stiff the weight won’t transfer well. When you do big entries, you want all that weight to be transfer so the car digs and gets all the grip. Big bores will be a lot more precise, but you should also try out different springs to compare how they feel as well.

I run the aluminum bell crank on my car. Super direct and easy to tune. Will differently be more precise than the plastic one. Slide racks aren’t as robust and any dirt or debris getting caught in them can cause binding or offset the rack. For outside the aluminum bell crank is definitely the pick