Right on Pe. Most of the newer gasser folks that show up at our field think you need to run 300 to 500 or more down from peak like you do on glow. This is simply NOT the case, they should be adjusted in the middle of the lean/rich drop point. Properly tuned to start with, I have to readjust EXACTLY as you stated -
warmer or higher or moist: lean out a bit
colder or lower or very dry: richen a bit.