Without a log file of the run you'll never know.
Though I still think it has nothing to do with the computer at all. With the ABS fuse pulled, traction control disabled the computer is not just going to yank power away and make it slower. It's not even making enough power to put it in an abuse mode or limp mode situation and retard the power.
Keep in mind with a perfect launch and perfect weather conditions the car is likely to only run a 14.5-15.0 quarter mile time. Any hesitation off the line or any slow launch/wheel spin will take many tenths off your time.
If you don't drag race it every weekend it's hard to get a rhythm down to get the best results.
