That's way too slow. Mine spooled to 7psi by 2500. I think the wastegate is leaking, or something is binding the turbo shaft. The 12a is sort of small and very responsive on a 2.6. One of the beauties of this system is the snappy response when right.

I'd unhook the sctuator, after you mark where the arm on the wastegate is situated. Then see if the arm will move in the closing direction.

Not responsible for advice not taken...