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I haven't read the entire thread but something seems wrong with your trap speeds.
I was running similar trap speeds with similar 60' times, 1,000 miles on the motor, stock manifolds, cat delete pipes, U/D pulley, Zr1 cam, and stock tune, bmr 1.4/1.0 drop springs and stock suspension.... and I was unhappy with it, lol.
Supercharged, headers, Pat G tune, suspension mods.... you should be way FASTER even if you spin as long as you keep your foot in it.
If you're an auto shift points could be a major issue, if you're stick a BAD slipping clutch or it's time to do a compression check on your motor.
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