I'm having exactly the same problem you are. In "The Baby Whisperer Solves All Your Problems," Tracy tells the story of a 5-1/2-month-old who is snacking every two hours, and her solution is to just start one night and not feed her. It'll make for a tough night, but the next day she'll be hungry and eat lots, and she should start waking up less. She does say something about the baby eating for a whole half hour at 5am, so I guess by "all night" she means from the dreamfeed to 5am.
The thing is, that's an older baby than mine (mine's almost four months), so I'm not really sure if I'm supposed to be doing the same thing or not. I've been trying not to feed her every time she gets up, just feed her once between the dream feed and the morning, but she still gets up at other times, and that doesn't seem to be improving, even if I don't feed her. Maybe because I *sometimes* feed her when she gets up during the night, she isn't able to understand that I'll feed her once during the night, and she sort of thinks that sometimes I'll feed her, sometimes I won't, and so I would be better off going cold turkey? I'm not sure. It's frustrating, because she used to be a great sleeper, going 8-10 hours at a time when she was two months old. Right around three months (maybe because of the three-month growth spurt) it all changed. I've been sort of trying to make her go half an hour longer every day or two. But sometimes it's hard to stick to, as I'm not getting much sleep and I don't have anybody else to help me at night most of the time.
I do think that you should try to do a dream feed around 11. I think you also might need to put your baby to bed a little early, between 7 and 8 instead of 8 and 9. You could at least try it, see if it makes any difference. I'm not sure that you could go cold turkey, though, because an 11-week-old might need at least one feeding between the dream feed and the morning. But I'm not sure.
