Short answer... Run the rear a little lower than level.. This is base and tune from there. Don't be fooled by the body of the car.
On scale weights( static) if you raise rear perch you will put more weight on that corner..
On track if you raise the rear.. you will now transfer that weight faster to the front. Car will be looser raising the rear. To a point.. It may also help front grip.. TO A POINT!!!
What does not work is the Texas chopper.. Keep raising the rear bc you have no grip in the front. If the front is already too low and you raise the rear.. You transition instantly to solid suspension on the front and you get "death push". So raising the rear makes this condition worse. You would need to raise front before doing anything else. If "EVER" you turn the front wheel and the car just grinds an refuses to turn, ALWAYS go to front ride height first. 95% of the time when you experience this condition, you are too low.
General speaking.. If not on the bump stop.. Lowering the end that has no grip will add grip.
This actually does clear things up a bit - at least for me.