My tack is off by 200 rpm as well. I have the limiter set at 8100 . I have hit the limiter at 8300 rpm on the tack.
after 7600 rpm i feel that it just does not pull as hard. i usally try to shift at 7800 .
i see that your getting closer to my 12.42.
before i got SC , i will be running the fulley built GTM tranney with a quaife diff.
Z
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 12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.
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