In a climb at full power, there is already a "fuel enrichment" due to full throttle being applied, so I guess leaning to max RPM (or thereabouts, as it's not going to be as accurate as leaning during a cruise since you are climbing & ambient conditions etc etc are constantly changing) but I think the chances of being on the lean & therefore overheating side is less because of the full throttle enrichment? - True / False / Somewhere there...