any 6.2 gurus out there??

[n8r67]

looking for some 6.2 gurus.....I have an 86 m1008 that I installed a gm5 turbo. I did turn the pump up the 6th turn and am running the 6.5 injectors, intake and ele lift pump. Now, im happy with how it runs dont get me wrong. Its quick to spool to 10psi egts stay under 1000. just recently I noticed though at crusing speed, occasionally under accelleration, it feels almost like a "powerband" and runs really well for short bursts. almost like a shot of nos. would be awesome if it ran that great all the time?? any idea what would cause this? is there an accelerator in the ip pump or something that could be sticking?? truck only has 60k, fuel filter is brand new. lift pump only has maybe 1500mi on it?? dont think Its a fuel supply Issue?? anyone experience anything like this??