Something else sounds up rather than just a bad launch and wheelspin, you should still be running, at worst, 106mph. Even when i had a shocking 60', wheelspin til 3rd, hot day, blah blah, i still ran the same mph of 114 even though my ET was 13.4. I also had a lightened flywheel, but it wasn't the cause of my crap times (best of 13.0@113mph).