going through the same thing, with a few differences. mine smokes after overrun, as soon as i give it some gas. does not smoke (at least significantly) in the morning or on acceleration. probably a different cause, but my approach (in case it may help):
1. change the valve stem seals (mine are 21 years old
2. take of DP and WG and turbo and look at the turbine wheel. If lots of soot and oily and not generally clean, perhaps the rear turbo seal is leaking. Not entirely sure if oil will show there even if the rear seal is leaking, not sure if oil burns immediately due to high temps or not. but plan or running the car till it smokes, then shut if off and then look at the turbine wheel (Thanks Faeflora for the suggestion).
If all is ok, then it is only one other thing: the oil rings. But since these require opening the engine, I would like to look at them last.
There could be other things, but in your case (and mine) probably ruled out: insufficient draining along the turbo oil return line, too much oil pressure fed into the turbo (in which case a restrictor would be indicated), high blow by, etc.
Unfortunately, I don't think good compression AND good leak down helps at all in narrowing it down (I got 160 psi on all 4 and 1-3% leakdown on all 4). Meaning, if all checks out ok (your case and mine), then what? is it the valve seals? is it the oil rings? is the turbo fed too much oil? too much blowby? partially blocked oil return line? you can't tell them apart.
good luck and post updates.