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What map sensor are you using? Are they scaling the map sensor correctly?
What injectors are you running? You are running E85 exclusively, right? You aren’t running 91 with 24psi, right? Post a log on Datazap and post here.
Did you try installing a boost gauge to independently confirm the boost?
Overboosting could happen if the wastegate never opens, but most tuners initiate a fuel/throttle cut slightly above target boost, just in case overboost or boostcreep happens, so I think it is odd that you are overboosting.
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