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The wastegate should be at the "open" or lowest boost setting at its default position since vacuum being applied to them closes them. Relatively simple to check with the top heat shield removed. Simply apply vacuum to the actuators and watch them slowly close.
If I had to guess your bank 1 actuator seems to be stuck closed as 30 psi is probably its maximum output when it causes faults.
I've also seen the pressure converters send full vacuum to the wastegate and pull it closed constantly but you mentioned it's been replaced. Bank one and two could also be swapped if necessary.
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