Exhaust gas pressure limits?

[Badger]

Ive had 3 different tunes, over a 3-4 year span, one being from most reputable guy ive ever came across. and they all act the same, and wasted my money.

WITHOUT my actuator modification,(which are just shims inside that keep the vg fins from closing all the way) , it just seems to get the same amount of fuel, but a lot less air. if i mash the throttler it spools up to 36-38, but then peters back down to 30, which leads to high egt. thats why i shimmed it to keep the boost around 38-40, been like that for probably 3 years now.

ambient pressure sensor is brand new, and reads the same as the stock one from 1.4 mil miles ago..., that why i dont know why its reading so low.

i was considering pulling my muffler off to inspect it even though i think its a straight-thru type. will check that.

has aftermarket intake with no bulky egr cone inside, CAC is not that old and the sensor that reads manifold pressure is right before the head, so if the CAC was the issue, the sensor and engine would not be getting the 40psi. Would be 40 psi pre CAC and less afterwards, if it was plugged or restricting.

Ive had this engine apart numerous times over the past 4 years so im 100% sure the cams or overhead is not the issue. ive made some drastic changes but the overall outcome is always the same, low boost - high egt

all new injectors., no improvement over the old factory.

egt probe is BEFORE turbo, i dont let it go over 1200 degrees pulling hills, only quick instances like getting on the highway shifting through the gears,

Does NOT make sense that i can lug a hill at 1250rpm , and it runs way cooler than if i take it up to 1800rpm.

1250rpm = 1100 degrees
1800rpm = 1300 to 1400+ degrees ( ecm calibrated temp was 1676)

im very close to throwing the vgt in the trash and visiting my menonite buddys dyno/tune shop but, figured id see what the rawze man has to say about all this, id love to put another driver in this truck but i cannot because i cant rely on him to babysit the PYRO like i do.