Have you called Rob? Not the first truck he has tuned. Sure he can get it straight for you.
I have tuned a bunch of LMM/Cheetah combo's.
A few guys here as a matter of fact.
If you need any tuning lemme know.......
Tony tuned mine and I have no issues heating up/building boost while pulling. 1st time out it did just as if were a stock turbo'd truck, very predictable. Very pleased, he can fix it for ya.
Spool up is smooth as can be. This is from a dead stop no inching forward. Truck pulls through the breaks at about 15psi.
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http://www.youtube.com/watch?v=YbLThx-WaL4&feature=youtu.be