I 'm using a T78 with a greddy Type R wastegate, when I run off of the spring alone it hits 1.25 bar and I instantly let off. Now thats at 1/4 to 1/2 throttle. I tried adjusting the spring with the adjustable screw all the way out and no change. Then I hooked up my mbc with a line from near the throttle, mbc line to top of the wastegate and the bottom part of the wastegate to a spare vacuum barb on the uim. Connected as said, I only get .58 bar with full or 1/2 throttle. I've already replaced the diaphragm and spring, so am I overseeing something?... Hopefully this isn't too confusing.

Thanks..