can you give a better description of when your getting the smoke, so youve said at full boost in the lower gears, what boost are you running? do you see any smoke on idle or on the overrun? are you seeing most smoke while boost is building or when max boost is reached?

maybe your turbo seals are letting alittle oil past causing some burning, pull off the induction hose to the front of the turbo is their any movement in the turbine, side to side in and out? sorry for all the questions just trying to help you sort this asap