So I started to mess about with the poor man’s bov to see if that was the cause of a leak/issue. I took it off completely and put the standard recirc valve back on and the car runs beautifully, no issues at all.
i was reading into the bov (or similar one as I didn’t buy it) and I think the issue was how much psi it could handle. It looks like most of these cheapy bovs can only handle 15psi at most and on WOT with better flow I was up past that, causing premature boost loss.
note to all, don’t use cheap bov’s, and if you do, make sure it can handle over your boost pressures :)
thanks to all for your help and suggestions!