I can't say I know a lot about this, but if you get a dyno tune, shouldn't you seen even better performance? (just saying this because when my new chip was dyno tuned, eliminating the original vortech program, I saw SIGNIFICANT gains in power). Dude, if this is true for you, get it dyno tuned, strap wings on that puppy and go ahead and break the sound barrier!
(oh yeah, don't kill yourself either
)