[Mike Pearson]

Not sure what the issues with your car are. I race a ladder bar car. I have Santhuff doubles on the front and QA1 singles on the rear. 110 lb spring rate on the rear. I felt that the front shocks were more important than the rear. At some point I will make the switch to the double adjustable shocks on the rear. My car is similar weight but runs low 10's. We typically run on well prepped tracks and my 60 ft times will vary .01-.02 on a typical day. track and air conditions can effect the 60 ft times as well. my car usually has 1.31 60 ft times and has been as fast as 1.29.
I see you race bracket car. My guess is it is more of a track issue than a car issue. Stick cars can also vary on 60 ft times due to clutch adjustment. for your car to be consistent in the 60 ft times it has to dead hook and limit clutch slip

What shocks are you running o the front of the car?