Izzy it is quite common for folks new to four stroke engines after being successful with two strokes to push main needles far to lean. The reason is two fold first while the two stroke responds to tuning by ear far better than a four stroke and that sweet spot is very obvious that is why most four stroke operators always suggest tuning by tach with a four stroke.

Now the second reason is simply most all four strokes will operate at lower rpms than the two strokes formerly used by the fellows . This is a hard mental transition to make with the results that a lot of folks will start pushing the needles far to lean when working with their first four strokes.

Two strokes are far more responsive and obvious by ear and this is why I always recommend to beginners to start with two strokes. This is also why I with two strokes recommend not using a tachometer but instead tuning the main needle to the pinch method (something I have taken a lot of heat for in these forums but that's OK, it works even better than a tach).

Back to your four stroke all bets are off with the high speed pinch though and the tach come into its own for those engines.

Anyway in summation anytime your four stroke seems to run hot the the reason almost all the time is either to much propeller load (diameter and or pitch) or simply to lean on the needles.

John