What RPM are you shifting it at and what RPM is it crossing over the finish line at?
Are you foot stalling it or is it on a trans brake? What RPM are you leaving the starting line at also?
Your reaction times are consistent bow The little ET change makes me think it was getting warmer outside air temps or higher density altitude between runs, correct?

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)