You are about the most stubborn person EVER... Blind allegiance to tti. So be it.
One car picked up about .12 the other .08 with a header change. No other changes except jetting to get it right for the increased scavenging.
I know, your car is special and nothing on a dyno ever gets proved out at the track. Maybe because after the dyno, something else in the combo wasn't right or needed a tweak to optimize what was discovered using a tuning tool. That's all a dyno is, like a test light... A TOOL!
If you couldn't get a car with 30 more HP to run better... you're a dope!