RV-12 1300 Hours
I do check my Carb balance at least once a year. Seems very stable after this many years, which I would expect.
Have prop set to .1 degree also. Always has had a vibration RPM about mid-range. Smooth above and below it. I just stay away from that range.
Yes, when below 50 degrees, I leave it plugged in all the time.
Helps the battery also I'm sure. I am still on original battery. 10 years is good. Seems strong yet.