My chassis set up

[84gt347]

I recently bought a steeda drag pac for my car. Drag springs, air bag, drag struts and drag shocks. I have steeda's double adjustable control arms and aluminum lower control arms. I have a 347 and a 100 shot of no2. i dont launch on the bottle. 1.9 60 ft times are killing me. 12.20 @ 120 et. I havent determined my pinion angle yet. I measured from center bolt to center bolt on my convertible and it it 9.25 inches on the uppers. They are aftermarket nonadjustable. My adjustable control arms are 8.75 long. The vert hooks better and transfers better. I was told that if my pinion angle is too far down that my 60 ft should still be better than it is . My tires are et streets @ 13psi 26/10.5-15. I need a low 1.7 maby a 1.6. If my pinion angle is out, i believe it will be to far down. My tokico are set to 5. Maby i was supposed to set them to 1?