If you're doing the 11pm feed as a DF, you could try offering it a little earlier. I do our DF between 9 and 9:30 because I don't want to stay up any later. If it were me, I'd probably move the cluster feeds forward a bit and do them, say 5 and 7, and then try the DF at 10 and see what happens. If that works well, you might even move it to 9:30, but I think most people do their DF around 10 or 10:30.