@BReeder! It sounds like you have done about all you can do.
I had a huge pile of old hay, leaves and coop cleanings that sat out all winter one year. the pile was about 6 feet high and probably 10 feet in diameter at the ground. The outer foot of the pile was mostly frozen, but the inside composted along all winter. I turned it in spring and tried to put the outside stuff into the center of the new pile and it was mostly composted about 2 months later, so ready by early summer.
I am just north of Green Bay, so cold - snowy winters here.
I had a huge pile of old hay, leaves and coop cleanings that sat out all winter one year. the pile was about 6 feet high and probably 10 feet in diameter at the ground. The outer foot of the pile was mostly frozen, but the inside composted along all winter. I turned it in spring and tried to put the outside stuff into the center of the new pile and it was mostly composted about 2 months later, so ready by early summer.
I am just north of Green Bay, so cold - snowy winters here.

The big pile I had in the corner of the pasture was about 15' x 15' but only 4 - 12" deep in most places. I went ahead and turned everything. Piled it up in an 8' x 8' area that is easily 3'+ now. Lots of very rich, dark compost out there on the bottom....
I swear it could have put most garden compost porn to shame...ha ha. I should have taken a picture but I didn't have my phone with me. I had let the chickens out to free range today and they were going to town on the compost pile. 
All the rest of my "freebies" are the same except that....