not much help but my DD is being the same about her breastfeeds now she's on solids too.
we're on 3 meals a day as well this week. (and she's also 24 weeks)
she gets much more food than that though!! she's having the same amount of cubes but also mixed with baby rice and milk, which is a way i thought i could get more into her.
she also has a petit filous every day since yesterday as my doctor suggested it would be a good way to get more calcium and energy into her. he said dairy products like that at this age are fine, more so if your baby is bottle fed as it's as processed from being cows milk as bottled milk is, so not to worry.
rosie never seems full, people keep telling me she'll let me know when she's had enough food, but she doesn't!
i can't help with how many ounces etc, but you can just start mixing the milk in with her solids to get it down her. don't worry too much though i think people sometimes can be far too obsessed with knowing exactly how much their babies drink1 i have no idea i cna't measure the boobies! if you know she's taking plenty of calcium and calories in with her solids you should be ok.