Try eliminating the RJC controller so that you're just running straight hose from the turbo to the actuator. That will give the lowest possible boost. If that doesn't do it, then you'll have to re-visit the WG hole. Be sure to radius the opening, putting the carbide cutter down in and giving it nice smooth curves, just like you're porting a cylinder head. The diameter of the hole should be around 1 inch to 1.1 inches. With my old 6765 I could lower the boost down to 12 psi if I wanted to.
I just read your sig "midly ported heads". If that's true, then a 6766 is too much turbo in my opinion. A 6266 would of been my choice.