the new turbo is in and i'm delighted to report that 1) my max boost is back to a normal 22 psi, and 2) my EGTs (exhaust gas temps) seemed to have declined as well.
with the new turbo, i have a little less power in the lower RPMs (bigger turbo needs a little more time to spool up, I'm guessing) but more power in the higher RPMs. I'm looking at a couple airflow improvements, and then I may head out to a tuning party in Michigan in a couple weeks to get re-tuned for the new hardware.
the new turbo is louder, too. Under heavy boost, I can hear a shrieking noise (sounds like the air being let out of a squeezed balloon neck), which I suspect is a boost leak somewhere. Will have to get that checked out.