You should have definitely gained more than that. I run a similar setup and I gained about 30hp over my baseline untuned. I would definitely look at your fuel as well. Is your SES light on? Sometimes when that kicks on, it runs richer. what elevation are you at btw? You could try and run it on another dynojet to see if the numbers are in the same ballpark. From the dyno's that I've done, 4th and 5th gear pulls don't make much of a difference, if any. I like 4th because it preserves my tranny.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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