Help!! prob w/ boost controller hook up

Hey guys, I have had this problem for about two months. NO ONE has been able to help me. I have a gt28r setup from atp tubo and I am having great difficulties controlling the boost. I tried many recommended ways and could not get it. I contacted atp, they said hook it inline with the vaccuum line from the diverter valve to the wastegate. THAT, did not work. I have been on many forums, gotten a lot of advice and NOTHING has worked. I'm sorry if I sound very F**KING P*SSED OFF right now, but I can't figure this problem out. My car will only run about 8-9 psi. I just put on a new evo dv, and i have a manual boost controller. I have adjusted it every way possible, cut the spring inside and tried many other techniques. Please anyone that has any ideas about this let me know because I am at my witts end..........didn't mean to have such a long post...