What is the stall on the convertor? and heat soak might be giving you some slip.
Also, you made runs with and without the 2-step, and you moved the launch around allot. Make small changes, and when you get positive results make another run with no change and make sure it repeats. Remember what I said, the car could have just picked up but might not have repeated.
You said before the car pushes when you power-brake. Could the last run have pushed you in deep? would explain the quicker 60' but lower MPH.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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