^^ see how the gate is on the A/R houseing of the turbo rather than on the runner. i say this because u are running a devided turbo and manifold, and i see the gate is positioned on just one of the runners on teh collector..
I had a manifold a while back, that had the gate situated on like runner #1 and not centered, and i got terrible boost creep(gated to .5 bar or 7psi, and it used to creep to like 14-15psi). I hear placeing the gate on the turbo houseing helps with boost creep.
By the way that gated exhaust dump is SICKKK!!!
:.. i saw an exhaust cut-out that was vacume fed off the turbo,, it would stay closed out of boost and once it got into boost it would open.. Yours looks a lottt better and makes 1000% sense.. i might steal that idea, lol