The MR2 T puffs out a cloud of blue smoke (Out of the Exhaust) only after boostin over 12lbs, then its gone. What does this mean?!

1) Does not smoke at cold start up.
2) Does not smoke at idle.
3) Does not smoke while drivin.
4) Does not smoke at low boost 8lbs.
5) Does not smoke if you rev it up.
5) Coolant level always full.

NOTES:

1991 3SGTE USDM motor
New Turbo
New 1.5mm metal head gasket
New Engine rebuild

I can't figure out what the hell is the fuckin problem here?

PEACE-