Bob,I agree with pacing, but for me that's more about heart rate and cardio momentum than acclimation. When I'm "in the groove" and climbing steadily at a comfortable pace, my heart rate stabilizes within a range, my breathing gets rhythmic, and my endorphins keep me in good spirits. When I stop and start again, I have to go through an equilibrium process all over again. This is quite different than altitude sickness. Taking a break or not doesn't really matter, a body either handles it or it doesn't. At some point going up is not a good idea at any pace.
With all the peaks you've climbed, I wonder if you ever had any amount of AMS?
