Finally the gravity got down to about 1.012 on Monday. I warmed the fermenters up to 58F overnight, and have held the temp steady since Tuesday morning. Wyeast (and most other places I've checked) recommends a 24 - 48 hour diacetyl rest prior to racking to secondary. Racking happens tonight, then the fridge gets set to 35F where the beer will sit until September.
Update, June 19: I unplugged the temp controller and am letting the fridge do it's thing. I set it on the lowest setting, it seems to stay between 32F and 35F, so I'm happy with that.