I have a big 16g with an internal wastgate and am having some issues...I don't have any boost leaks..I think it has a 8psi spring in it but am not sure...when I run the wastgate by itself with no boost controller. It hits 8psi and then in third gear will creep up to 15...when I put a boost controller on...I can't get it to stay at one spot...it will go to 8 to 10 and then go up to what the boost controller is set at. If I close the controller all the way it boosts perfect but then the wastgate doesn't work and it will blow up. So I'm lost. My theory is is that the flapper can't stay closed long enough for it to go to 15psi...is this right thinking?