I would say you really need to get that thing scanned. Sounds like your holding 2nd gear to long. Without higher ratio rockers or a cam your power is falling off around 5700 rpm but the the dhp is probably shifting at 6200? Once your in third it sounds like a fueling issue or excessive timing pull due to KR. The DHP has faster KR recovery so it sounds like its pulling timing, gaining it back, pulling it again. If you let off the go pedal and then get back on it does it continue to climb? Maybe they messed up that pcm and set the rev limiter to low?
It shifts out of 1st at 6000 rpm. In 2nd gear at about 5700 rpm there is a slight hesitation before it shifts then it does the limiter thing at about 105 mph.
If I let off the pedal it will continue to climb...or if I am accelerating gradually, it will climb to much faster speeds.
Yes, I thing DHP messed up the programming. I will live with it for now because I am not into drag racing with this car but before long I will switch to an Intense unit.
....VERY disappointed with DHP.......hope you guys are listening....