Pissed about car, it just doesn't hook, and popping sound from rear

[MustangLife]

I'm pissed about my car. It won't hook like it should. Mods are in sig. I car got a best of 1.82 short time on drag radials launching at 5500-6000rpms with eibach sportlines all the way around with lakewood 90/10 struts stock rear 50/50 shocks, stock uppers and lowers and 2 busted quad shocks. I than add fox body 4cyl front springs, they were used and very loose. I add x2c upper and lower control arms remove quad shocks (they were completly trashed) and et streets at 10-13 psi at the track. And only get a best of 1.77 short time launching from 5000to 6200 rpms. And consistant 1.80-1.85 short times. And also after the control arms install I get a pop sound when launching at the strip or taking off fast on the street. So what the hell is my problem and whats with the pop. Did the control arms mess up my pinion angle that bad. There suppost to be at a -2 degrees. My car runs a best of 8.40 in the 1/8 mile and it should be running 8.10's or 8.20's