My DD started dinner @ 7 months (had her on solids from 5.5 months)...slightly different situation to yours in that over a few nights she stopped waking for the 11pm feed (and I was never a fan of waking her up for it) so I decided that she needed dinner to make up the loss.
She generally now sleep through the night - does have occasional night wakes but I don't give her a bottle as I'm happy it's not hunger related as it only happens every few weeks.
DD always had a bit appetite, and always took slightly more in her bottle than her age guide...but once on 3 meals I started to reduce the bottle amount (with a view to having formula gone by her first birthday). She now has 7oz first thing in the morning...breakfast a couple of hours later...5oz few hours later (am cutting it down gradually from 7oz), then lunch - have cut the afternoon bottle entirely (gradually reduced the amount over a month while making lunch a little bigger), dinner @5pm and 7oz bottle @ 6pm.
Hope this helps a bit!