I have two deeps for brood boxes. In Indiana that is the rule of thumb, I guess.
I did not understand what you meant in your last sentence. "however, if they don't draw it out and pretty much fill it, you'll have to much space for winter." Do you mean if they don't draw out the third box, and fill the second with brood? I don't mean to be dimwitted, but I was not sure what you meant.
I definitely want honey, so I guess once the two boxes are full, I will stop feeding until August. ???