I'm suggesting just rich of peak RPM to allow for some mixture spread among the cylinders (especially in a carbureted engine), so that the leanest cylinder has a better chance of landing outside of the red zone. Before the OP (or anyone else) gets too stressed about this, however, I want to repeat that below 65% power it doesn't matter where you lean with a regularly-aspirated engine. This is only for people who want to get the full performance out of their planes by cruising at (e.g.) 75% power. If I'm willing to give up 15–20 knots in my Piper PA-28-161, I can cruise at 55–60% power all day chasing birds through the sky, and set the mixture wherever the spirit takes me.