3 turns sounds a little rich, I had one which ran at 1 3/4 if I remember correctly. For me it was a fly and forget sort of engine I never needed to touch the needle.
To set the needle up I would start it a little rich (around 2 turns), let it warm up, then lean in the needle until the smoke started to thin out. I'd then open it maybe an 1/8 of a turn from that. Then I'd check the throttling and idle, and if that was good I'd just fly it.In flight make sure there's a good smoke trail, from there it should be good to go. I never touched the regulator on that engine.

Remember when adjusting the needles to give it a few seconds to wait for a change, it takes a little time for the change to take effect.