The issue I'm having is that my boost keeps dropping 2 psi by the time it hits redline. Boost always comes on strong until it hits about 7k rpms and starts to slowly fall off. This is why I hit 470tq in the midrange and 696 hp up top because I hit 28 psi but dropped to 25.8 - 26 psi at the end. I would have made 700 if it weren't because of this issue. This kinda sucks because I want to keep the boost in the midrange the same up top so I'm not over boosting at the peak tq area. My current setup is

Sidewinder manifold
6262sp T3 hot side with .82 ar.
Tial 44 MVR wg with 10 psi spring.
MAC 3 port solenoid
Controlled via KPro

I'm not sure how accurate the solenoids are at high duty cycles but to hit 22 psi I'm at 66% duty cycle and to hit 28 psi I was at 95% duty cycle. Are these things even working properly at such higher dc? I wanted to run more dc up top to keep boost level but I was maxed out. When I say 22psi I mean in the mid and dropping to 20 up top and 28 psi dropping to 26. I get the same issues even at 14-16 psi.

Someone was saying that I could run the 4 port solenoid to get more out of the spring and to lower by boost controller duty cycle. Any thoughts in what might work?