I don't know much about the DO level readings...wish you were my neighbor and we'd survey my pond too.
Your temps from top to bottom tell the tale that the aeration is turning the pond over well, but I avoid getting that warm. I try to get my aeration running only at night about the time my pond is in the low eighties. That time is quickly approaching here. I have read that there are not regular issues into the 90s, but most want to stay below 85 if they can help it.
Good to hear that you have had no more floaters!
