Day 2 is a doozy... Part of that is due to the work required to haul all your stuff up the extra 2k elevation, and the worse conditions for sleeping. By sleeping at OC, you have the extra 2k, but without a heavy pack.
Why not try it out and see how much difference there is?
You could also throw in a little extra food, and spend two nights at OC. That would make the trip that much easier.
