If your dh can settle him, I think it's safe to assume he doesn't need a feed at that time. When you go in, he knows he can get milk so he wants it. Make sense?
I understand you have tried the df in the past and it hasn't worked, but it may be a good time to try it again. I could'nt do it until my lo was around 5 or 6 months. Then it worked like a charm. You may find that that is what he needs to get through the entire night or maybe just one more waking. If you decide to try it, give it one full week to make sure he's had a chance to catch on.
It also seems like his night waking almost coincides with the starting of solids which is quite normal. It is hard on their digestive systems, etc, so they do tend to wake more.