hey man you need to run a smaller restrictor for your turbo oil inlet because that high oil pressure is pushing oil past you shaft seals it only needs a trickle to operate. mine was doing the same thing and all i did was use a smaller inlet 4 years ago. now my turbine shaft seal needs to be replaced because when i rebuilt it i just bought the bearings and couldnt afford the whole kit at that time and it only smokes at a after i roll to a stop for a couple secs then stops but never under boost.