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Latest update: I just got off the phone with GTM. Smoking issue is FIXED. They ended up decreasing the oil restrictor size by .002 inch. Everything is looking good except for the boost creep, but they offered to let me take the car home for a few weeks to enjoy it. However, since I’ve been without my car for so long, I preferred they kept going to finish it up.
To really control boost creep, they want to change to a larger turbine housing to allow better response from the internal wastegates. This change is not expected to make much impact to the super fast spool-up they are getting now. On the outside, this should take no longer than 2 weeks, but they are shooting for earlier.
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This was from one of GTM's earlier twin turbo builds. The boost creep only applies to internally wastegated setups, which is what I'm running. The .86 housing allows the exhaust gas to escape more readily to prevent boost creep. When I was talking to Sam prior to my turbo purchase, I vaguely remember that he recommended going with the stage 2 since im running internal wastegates.