Thanks Brian.
I will test the sensor, as my mityvac will push as well as pull.
The valve is my current guess. I have a couple tests planned for it.
I'm thinking that it had a piece of debris blown into it, that has not come out with repeated cleaning.
And I guess I will start researching the procedure for adjusting the wastegate.
The ALDA seems pretty straight forward, just have to be careful.
I have no intention of running this car without a functioning overboost system. It's doesn't have to be my daily driver, I just prefer it to be.

Might be a week or so until I get some results, but I will post what happens next. Let's hope for nice weather in NE.