Boost reads lower after the intercooler than it does directly off the compresor outlet, but not 5 psi. It's actually not all that important where you have it, as long as there are no restrictions in the point you use, and you take into accoutn where it is when you are reading it. It should be consistent no matter where you put it.
"Divorcing" means removing the AP and putting the ECU back to stock, like the AP was never there. It's a PITA though, so actually it woud be a good idea to try some other things before you do that. I am starting to think maybe your boost solenoid is dead.
You have catless TBE, BOV, and absolutely no other mods right?
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FWD is the new AWD
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