I use deep litter with hay on wood floors too. I do not have food and water at night unless it is very hot which I think makes a huge difference. Every morning I use my spade fork and carefully get under any massive poop piles or those flattened poops that are obvious and just throw them out into the yard. I try to leave as much of the clean hay as I can. When it gets more broken down out in the yard I put it in the garden. In the winter I keep the hay much thicker (about 1+ foot) but this time of the year I use about 1/2 the hay. It's working great for me and when I did a full clean out this spring I was pleased that the floor was not wet at all. Maybe because I don't just leave all the poop in there I'm not really doing deep litter? I'm not changing out the hay all the time, I am adding to it a couple of times a week at the most, and not very much at that.