I concurr with most of your post however, the bit I bolded for you is simply not true. I regularly run engines at higher than 75% power, 85+% even and the CHT's are very good indeed, at times as low as 300-310F and at worst 330F. In fact this is cooler than a full rich takeoff. They are done at high power settings Lean Of Peak.
Yes but only in cruise.
Sure one can cruise at 100% power - 165kt IAS for me, and loads of airflow.
23 USG/hr
