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Well, you have ZERO boost control. Get a handle on that before you do anything. As it sits now you don't know what kind of boost it's making. 21.5 is sensor max. So when you see that number, it's probably above it.
To hit that, odds are a wastegate is stuck closed. And yes, one stuck closed and one working will overboost.
Vacuum gun and verify that both gates move. Also make sure they hold vacuum. Should be no bleed down at all.
You could have one dead solenoid. I've not seen that the DME knows if one is dead or not, which I find odd. Good rule of thumb is to just start with new ones IMO.
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