Hmm...what happens if you feed them when they wake at 9:30PM? Do they sleep thru?
They might soon be ready to transition away from the 3 nap/catnap too, in which case you could try 3 feeds spaced 2 hours apart and put them down earlier, see what that does. Babies do nap transitions at vastly different times though, so you have to make your own judgement call there. I want to say we were doing 3 90-minute naps around that age but as we pushed A times a bit longer, which you can try in maybe 10-15-minute increments, that last nap got pushed so late as to be useless except for making DD under-tired by our usual bedtime.
Also, who's going in for nightwakings? When I started sending in DH instead of me (the one who smelled like milk!), he'd pop in a binky and she'd go back to sleep more readily; if she smelled me, she expected a boob! LOL Non-nursing parent might be the better choice to try to break the cycle?