So I am left with rest, breathing technique, water intake, and diamox.
Well, acclimatization. Diamox is really an adjunct to that.
But with your history you should not be under any illusion that anything but acclimatization is remotely as important.
Diamox is not a substitute, nor are any of the other things.
But I've never heard of breathing technique being important in a person who is not short of breath at all, and it is not one of the problems routinely identified that I've heard of.
