I think you are talking about the pilot jet adjustment. This is only going to have much effect at, and just off, idle. and yes, normally 4 turns would be considered too much, go back to 2.5 or so. You need to look at the main jet first. Look at some of the pinned carburetor threads. The main jet size is the most important if you are doing WOT cuts and looking at the plug.
If it's running fine with good power and doesn't seem to be getting too hot at sea level (since it's cold), you are probably fine. Next time you have the plug out, look at the top of the piston at TDC with a bright light, if it's white, THEN you can worry.