I overwinter on single 14 x 12s with OMF.
That is equivalent to a brood and a half.
I would be removing the QE, but more likely the end of the month at honey harvest. I would be considering what stores were available between your two colonies and progressing from there.
If leaving full and capped frames (well, any stores) at that stage, I would be juggling them around to fit in varroa treatment and then marking them (before feeding), so they could be recovered in the spring, if not used (or required) by ensuring they would not get mixed up with any sugar-honey stores added later, to completely fill the super for winter.
Remember you have two colonies. Remember it is easier to manage two than one, so don't think of each hive in isolation. You have rather more options than those with only the one colony! Use them to your (and the bees') advantage.
Regards, RAB