I am sure you feel the time you are proposing to your ex is not enough time with your daughter and I certainly would agree with you. If this works with your work schedule though, I would definitely go ahead and present it to her through her attorney and see what happens. She might surprise you and agree. I know, that is probably wishful thinking on my part but I try to look at the brighter side of things. The worst thing that will happen is she won't and you will have to go to court.
What state do you reside in? The problem you have right now is you don't have anything permanent yet, so she may end up getting away with going to her sister's and interfering with your visiting schedule. Understand, I do not feel she is doing the right thing. Your daughter needs to spend time with both her parents. I do know, once you have a final CO filed, and she did not follow it, you would have grounds for contempt.
Hope this helps. Good luck!