I just let my chickens follow nature's cycle - but then, I'm further South than you and I'm just doing this for a hobby. As long as I have eggs to eat, and some to trade with neighbors, I'm good.
That's the problem with EE cocks. Even if they came from a blue or green egg, you don't know if they actually inherited the blue egg gene. I try to find my EEs and OEs that have one true Ameraucana parent, but unless you know the breeder, you never really know. That's why I really want to keep my Wheaten boy - he should have blue genes to pass on.