Hi and welcome to the baby whisper boards
While you are trying to implement your new routine with Cluster Feeds and Dream Feeds, I would make up a normal size bottle and offer it to your lo when it is time to cluster or dream feed and see how much she acutally takes.
After a few days of analysing, you can then adjust the bottles to the amount that you know she is going to take.
HTH's
Good luck and keep us posted on how you get on.
Paula