Looking for grt guys

Looking to see if any GRT guys would share there dry slick setup info with me. I have 2011 Grt 4 bar USRA A mod. Car is on the pullbar with 4 bar both sides with the spring behind on the LR . My current problem I am having is the car loose in the center I am having to wait to long to get back on the throttle. Car info springs Lf 500 Rf 550 Lr 225 Rr 200, shocks Lf afco 9-2 Rf 4-8 Lr 9-3 Rr 3-7 Rear % 58.6 Ls% 52.5 Lr bite 110 Stagger 1'' in the front and rear currently leading the RR 1/4'' bar locations is LU 44.5* LL 7* RU 14* RL level. Pullbar is a biscuit style 3/8 preload and tires are kk704. Also have chaining on both sides. Any info would be helpful.

I would start by lowering the LR spring to a 175 or 200 tops, and take some rebound out of RR and some compression out of LF. I would personally run around a 3-4 on RR and a 5-4 on the LF. You definitely have plenty of rear percent.

Where do you have your j bar set and have tried a straight bar on your GRT instead of a j bar?

On my 2012 G12 when slick I ran:
Springs: Integra LF 500 RF 550 and 175's across the back.
Shocks: Integra LF 5-3 RF 3-6 LR 8-2 RR 3 or 4 depending on the track. 80 - 110lbs of bite ( with driver in car )
Pull bar with X-Factor blue /grey bushing with 1/4" preload, 1 inch from the left on rearend and all the way to the left on the chassis 20 degrees of angle and no 90/10 shock on the rearend.
Left chain out to get 47 degrees on top bar at full drop. RR chain 3 inches of slack at ride height. RRL bar at least flat sometimes downhill to the chassis. The more you shorten the right side, the better it will be thru the middle.
I would run less rear percent also to see if that helps.
Wheel offsets: LF 2 RF 2 LR 3 for tacky 2 for slick RR 3 for tacky 4 when slick. Good luck.