D.W.
is it possible to find another day care facility that both can attend that focuses more on a curriculum? we've been very fortunate that our day care has a set curriculum each month, and our kids are very advanced for their respective ages (2 and 4) with knowing numbers, letters, colors, shapes, simple words, etc.
That way, despite having to make a transition, they're together, and you're not running all over the place.
Each kid is different. Our son moved to a new class at day care a few months ago and struggled for weeks with the transition despite being there for a long time. His little sister went into her new class without a peep. Different kids, different adjustment thresholds, I guess.
Good luck.
Here's an example of the curriculum at our day care.
http://www.theplayschools.com/page/173/Curriculum