OK, I did just adjust the wastegate and I am now up to about 10 PSI. I know that a bit more would be advantageous. But, the awful retaining spring is something I don't want to have to reinstall again.

With 10psi, I still feel like I don't actually have a turbo. Many have pointed out that boost pressure without a functioning ALDA will not feel like the turbo is giving any power. With slightly only 10 PSI of boost, I'm thinking I should at least try bypassing the switchover valve at least to see if I get more power. I do have a boost gauge so I can watch it and make sure I don't over boost.