16x33 tire running tires about 6 psi,launching at 4800
You just wrote what a lot of your problem may be. Never mind that it chirps the tires (?) Racing slicks chirp the tires) With that tire pressure and a tight convertor you ain't gonna get any 60 ' outta it. Maybe if you were hitting it with nitrous but on the motor with a car like that. You need more comvertor and probably more air in the tires.
I still am not understanding a soft compound drag slick chirping the tires though.
Your numbers are fairly close for what you say you have.
Ed