2007 GT Needs strip help

Alright, best run in this car is an 8.49 at 84mph with a 1995 60' but since that run the best i can pull is a consistent 8.6 runs, mods are shorties, LM1 catback, brenspeed tune and JLT intake, stock 3.31 gears, my question is im ready to start doling out more money towards the 07 and what would be a more worth while mod, control arms or some drag radials, my problem now is i can powerbrake the car hard enough (auto) to see the benefit of drag radial compared to the R6 hoosiers i normally run on the car, any input is great and am willing to hear any other worthwhile mods to get my car deeper into the 8's in the 1/8th
 
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