Can you post or list your AFR with the RPM, AFR and RPM?
Some testing needs to be done in the car, my E85 motor ran 2.5 MPH faster in the 1/4 mile shifting the 2 speed tranny at 7300 RPM versus shifting it at 7000 RPM, every other part of the time slip was almost identical, within .0002 ET, up to the 1000 ft clocks