How low is too low?

[Gravy]

I started at .035 and .032 and it worked fine, now i've put it down to .028 and still have some plug blow out. I know i have a boost leak as well, but it's pre-MAS. So the AFR is running fine, but i get in the higher rpm range and she shakes good and i've felt it before. And those gaps are at different plug change intervals, and i have run .028 for a while with no issues with the old stock turbo's.

Thing that is driving me nuts, is the car only wants to put out 8 psi give or take, and i'm not sure if it's the wastegates not fully closed(which doesn't make sense being at a constant) which is where these wg's open. Go though all the trouble upgrading turbo's and i have to spend a week trouble shooting the problem. It's a slow gradual building of boost too, but i know i'm getting blow out, that's easy enough to fix. The boost leak testing equipment is purchased, just has to be fab'd up and tested.