I wouldn't say the premix has anything to do with it. First, it sounds like you're running WAY rich. When I first went single turbo I had this same problem...cutting out around 4 or 5k and lots of smoke. I got it tuned and it was fine. Also the problems with idle I believe have to do with your tune I think once you get it tuned you should be fine. Or at least it should be better anyway, and if you have any other problems you can address them at that time. I would start with a tune, definitely.
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