1st off have you verified your boost guage is not faulty or has a leak in the line leading to it ?
tap off the turbos outlet scroll and run a dedicated boost gauge there to see if there is something restricting them such as a rag in the intercooler etc.
check your turbos exhaust and intake wheels for damage
verify you have no large exhaust leaks
check to be sure your turbos are spining freely and have no bearing damage
check the waste gates to make sure they do not have damage to the valves even if shut if the valve or the seat for it are damaged it can cause issues
check the blow off valve diaphram and seal/valve
check all silicones they may look ok but have a tear un the underside
check the intake and intercooler for any large holes or cracked welds
the welds can crack and be just fine under vacume but when boost is applied they will open up the seam and allow large amounts of presure out
< have seen this happen with liquid to air intercoolers alot >
thos turbos should have no problem pushing 25 psi into that engine so im going to go with most likely your waste gate or turbos themselfs have a issue.
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