This is my first post and I was very surprised by how quickly I got some helpful replies. THANK YOU GUYS.
As far as engine leaning out during flight I do not think it ever happened - it sounded more as if it was underpowered. Sounded like it was running at lower rpm than on the ground. Plus I was not really running it open throttle, but rather at about half throttle, hovering (attempting ). I realize that it probably gets less airflow than in during normal flight, but can hovering overheat an uncovered engine?