Well the fact that you didn't get an exact answer or concensus might be your answer???

While not exactly the same as a full scale four cycle, some characteristics are similar. In a full scale, engine cooling is accomplish with fuel flow, oil flow and air flow. Screw up any of the three and the other two must compensate. So while tooling along at altitude one monitors the engine temps and if they start getting hot, you richen the mixture and/or open the cowl flaps (if equipted) to help cool it off.

Then there's the little tidbit offered by pe about the engines leaning slightly as they warm up. So.... while conventional wisdom would indicate that higher humidity/temps/altitude would indicate that the engine needs to be leaned out, I've found that when the amibient temps get pretty hot/wet, that richening the thing just a tad sometimes works better and we're not talking very much either.

As for Pat's definitions; red hair is the coarsest and about half again the diameter of blond hair so while I'm familiar with your first two definitions for the above acronyms, I've never run into the third one and based on hair diameters it would seem to be the largest ajustment of the three?????