I got a b20 turbo t3/t4 turbonetics. External tial 35MM wastegate. I got a 7LB spring in the wastegate but for some reason it won't stop boosting. I gone as high as 15LB on a 7LB spring and I think it can go up more but afraid to. Open up the wastegate check it, no screw loose, spring is perfectly fine, and no damage on wastegate. So now I'm stump. Need some help