7 hours is a great time rt time for San G. Much faster than I would ever do it. With that said, faster you go up the greater likelyhood there might be AMS problems.
I think it could be associated with hydration. When we go fast, in a lot of cases, we do not drink enough. I make a point whenever I stop to check my reservoir and if I have not had enough to drink, I pound down electrolytes. I do not have any AMS problems in our local mountains day hiking so, all I have noticed by doing this I have eliminated after hike cramps and I recover quicker.
