Sugar shake on new hive

It had been cold and overcast yesterday, but today was clear and when it warmed up in the afternoon, I went into the new hive.

First, however, I placed the entrance reducer in the old hive.  Jeremy Rose, as do others, advises placing entrance reducers this month.  Since the main honey flow is over, robbing will start happening as colonies are storing up for winter. 
The returning foraging bees were initially confused.

Then, into the new hive, where I placed an entrance reducer, as well.  I spotted the upper queen.  There was also a patch of capped brood and larva, about 3.5 cm on two frames.  Honey production, although ~90% nectar continues and seems to have increased.  Eric Mussen, the UC Davis entomologist, thinks that the honey is being made from the bees in the lower brood box.  Bees usually store honey above the brood, and so they are just going through the middle box and storing honey on top.  Furthermore, he suggests that the nurse bees from the top box were attracted to the bottom brood box.  But since I saw brood on top today, I know she's laying and there are some nurse bees.  Maybe the honey makers from below and the baby makers on top are competing for space.  I think I'll ask Tom Seeley.
In the bottom brood box, I spotted the queen and lots of brood.  I did a sugar shake count: 11 mites in about 250 bees, 4.4 mites/100 bees, and acceptable number.  I had been prepared to treat with formic acid (Mite-away quick strips) but will now hold off.  I will repeat sugar shake test in a couple of weeks.