More disc brake questions

I had a AAR that I raced and when I changed the torsion bars to the .830 and 90/10's it changed the weight transfer and the rear wheels would lock up on hard braking. Installing a adjustable valve I could make it stop with out locking any wheels on straight stops and when it was set up for corners just turn the knob and it was set up for the stiff suspension.
Don't let anyone talk you out of a adjustable valve.