While racing a stock car, you want to put it in 3rd on the line and leave it there... Shifting seemed to get me nowhere ET wise..Your RPM's will be around 5000 where they should be at the traps.Going into OD boggs RPM's and produces transitional knock(even with alky sometimes)Affecting MPH and ET. I always was on the EDGE for detonation, so I would see KR in OD on the few times I forgot to put lever in 3rd after a burnout. I always over octaned my car until I got a good grasp on tuning it. After all that, I would run with 93 octane and meth.
I suggest setting the boost at a safe level like 20psi and going to the track playing with timing,fueling,ect. Get the best tune you can on 20psi and go from there. I made 30 passes before I started moving up on boost. Tuning is key
I never did long runs because It is too dangerous IMO(car,me,other people).. I lived next to the best track in FLA, so I naturally drag raced 1/4 mile.