You definitely made the right decision. The last two miles to the summit are arguably even more difficult than the switchbacks. Considering your condition, it's unlikely you would have made and you would have put yourself at risk of AMS.
But getting to Trail Crest is an accomplishment in itself. Topping out at 13,600 feet and 5300 feet of climbing is nothing to sneeze at!
Thanks! It was tough turning back at that stage not just because the weather was good, but because I was close enough to see the summit hut and knew that I had less than 1000' of elevation gain to go. But my progress had pretty much slowed to a crawl on the switchbacks, so I didn't think I'd make it back if I went much further.
Oh well, I guess I can try it again next year.
