boost

So I recently installed the Cobb j pipe and did everything proper. Took the restrictor pill out and put their stage 2 tune on. Worked fine at first the first pull. After that my DAM dropped to almost 0.125 then I reflashed and now it's sitting steady at 0.5 which is still screwed up. When I go...

I know there are multiple forums for this but none of them seem to be my exact issue or they are never solved. I have a 2003 Subaru wrx completely stock besides an exhaust. No matter what gear I am in I can only reach about 3-4 psi when the target boost is 14 psi. I once disconnected the vacuum...