If memory serves me correct the 6.7 will put out about 45 - 48 psi of boost. It would seem as thought they did not have all of the bugs worked out of the program yet? Have you called Edge to see what they say? It could be the "Race" type of program? When I was building blown gassers and Alcohol blower motors we set the power curve pretty flat and short. Power would come on at around 4,500 and start to fall off around 6,500 rpms. They were total pigs under 4 grand, but get it up on the pipe and "Hold on Ethel we're goin' for a ride".

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07.5 3500 Quad, SRW, 4X4, Laramie, Leathered, Dark Metallic Gray, 6.7, 68RFE, 20K Reese, Ride Rite's, 2 Viair air compressors, Bully steps, Kleinn Locomotive air horns (5 in all), Billet polished locking fuel door, 'A' pillar mount Auto Meter Pryo, PML X-deep trans pan
06 Durango 285 RL 5'er Lifted by KZ