My old car(3220 currently Duster) has been 9.50’s at 140 on CE 3 way shocks all around, 002/003 super stock springs and Hoosier 28 by 11.5(10 inch measured) QTP tires. It’s not even minitubbed. Was slightly slower when I raced it. These are bias DOT tires he and I both run/ran with tubes to stiffen the sidewall
Ultra consistent car.
I suspect the change to a more forgiving bias tire and some clutch adjustment will go a long way towards making the car more consistent.
Frankly, if you want to remove being a semi rocket scientist…lol and make it much easier on yourself…..put an automatic in it.