Congrats and great TR!
Question - why 6L of water from Outpost? Why not 1L and keep topping off? Then at Trail Camp fill up to 3L or so. Water is heavy....................DUG
I am not sure why I did that, for some reason it seemed like a good idea at the time. By the time I got to Trail camp I was thinking "Why the heck didn't I just bring the filter and 2L?"
Your not making Trail Camp with the load might have saved you from experiencing worse altitude problems.
I never once experienced any altitude issue, just lucky genetically I guess. Only issues I had was having to stop to let my heartrate slow down, and muscle fatigue.
About the water: It might have lightened your load if you had taken a smaller amount, and refilled at the last water (at about switchback #9, I think) above Trail Camp. From that point, people take about 3 liters. Some people (including me) don't even filter it there.
Sad thing is I knew about that, but did not think of it at the time. There was actually water flowing all the way up to Trail Crest with the rain going on.