First I would loosen one fuel injector line at a time to establish if the smoking is one cylinder specific. Just let it idle for enough time with each cylinder disabled to see if there is a difference.

Next if the condition seems to not be an individual cylinder remove the boot from the turbo and idle again. This just establishes it is not some odd turbo seal problem. I know it does not sound like the turbo. Except for the large cloud of smoke on acceleration. That may be an indicator of picking up from the pooled accumulation of oil . If it is also wet with oil in the boot is of course another indicator. It should be dry.

I am also not an expert.In fact very far from one. Still I would think on a serious leaking injector issue the smoke would be black rather than blue. On that basis I would put off an injector checking again at least until the two tests where done.

Posting the oil consumption rate of this engine could also be an aid to figuring what may be the possible cause.