a shitty BOV, and wastegate problems will cause a boost leak. The drain line will cause all kinds of oil burning/leaking problems, if it isnt correctly run. I am running a very similar setup, but with a .63 exhaust housing, 2.5" ic pipe, a HUGE FMIC, a TRUST WG and a really shitty crush bent 2.25" exhaust. I hit .8 bar(~11lbs) at ~5k in 1st & 2nd gear. but in any other gears it hits full boost around 1k-2k sooner. have you tried to disconnect your EBC and run straight WG spring?