Islander
I agree with you. It's a case of how much to write in response to a 1-liner, that's all.
I fly at 60-65% myself, with CHTs never above 430F and that is only short-term in climb. My normal cruise CHTs are about 350F, and often lower.
Funfly
There is no point in leaning a little bit initially. I would suggest the best way is to level off (trim forward on the elevator, trim off any rudder trim) until the target IAS is reached, and then bring back the MP to the target value, bring back the RPM to the target value, and then bring back the mixture to the peak-EGT or LOP point.
No point in half-fiddling with the mixture - even if it does no harm by the time you have brought the power back to a 60-65% cruise setting.