Hello Len,
I was running 7 psi. I initially thought it was the Tial wastegates, I took them off and tested them and they opened about 1 psi apart. So I sent them back and Tial admitted they were out of spec. However, when they came back, they did the same thing. According to Tial, it was the first time Tial's had been put on a twin setup, maybe they have improved their matching since then.
This imbalance in cracking/opening pressures may be why I needed the balance tank. I'm glad your not seeing the problem, I chased this for 3/4 months before I was able to resolve it.
Again, you guys did a great job! Keep us posted on your results.
-Dave.