:I have a WI kit on my car from a couple years ago that is pressure activated ( off/ on) and it would prefer to have the variable controller linearly increase the flow rate as boost builds. The controller has an "onset boost" and "high-boost" settings that need to be set right as well.
tune your setup to max .. whatever... then pull the 'variable controller' out of the system... you'll be amazed at the performance difference. (for the better).