I did reply in the PM as well, but i figure I would explain what we did while diagnosing your setup.
-Part dimensions (turbine shaft, and turbine seal bore in CHRA) were inspected for wear, and dimensions, all were within spec.
-Turbo was rebuild, and balance was verified
-Turbo was run in our VSR balancer with heated, pressurized oil, with no leaking past the seal.
On all accounts, with multiple checks, the turbo is good in our eyes.
Possible causes of the continued smoking:
-too much crank case pressure causing more oil than normal to bypass through the piston seal (very rare btw)
-oil drain tube blockage causing the same (more common)
-too much oil feed pressure (normally not an issue with journal bearing turbos)
-you still have residual oil in the manifold and dump tube that needs to clear out
-you have oil leaking from elsewhere in the system like valve stem seals or cracked ringlands causing severe blow by.
Now im not sure what other testing you have completed, but I would recommend looking in other areas to ensure that your car is tip top. We did as thorough a check on the turbo as possible, and it's good brotha!
Certainly keep me informed of what you find Richard!