Mike,
I typically don't run my well or my aeration at all in winter. Like you said D.O. is so high, and due to the low temps metabolism of the fish is really low. I don't even feed them much if at all so no waste or ammonia problems. I do set a diffuser in shallow water just in case we get heavy snow over thin ice and I can't get on to keep the snow off. Otherwise I don't aerate at all in winter and just keep the snow off. The trout do just fine under the ice. However you being 2 hours away you may not have that option.
