I know some people here think the more time they get with their kids the better, but I also believe kids need to see both parents and that we LBS need our down time (I miss my kids but I'd rather not be a single parent 365 days a year).
Hey, that's me!!! I will take every minute available with my kids, but don't misunderstand my position. Kids DO need to be with both parents. My willingness is to take them from a babysitter or a forced sleepover when H doesn't want them, it's never, ever been my intention to take time away from their dad. In fact, I've offered him extra time, which he's consistently declined.
Card, moving to the week at a time seems like a good idea. Toddlers like consistency and it sounds like that's been lacking. Wishy-washy doesn't work for anyone. I do hope your STBX is OK, and that you can navigate some assistance for her (because it's in the best interest of your D) without getting sucked into her drama.