It's part of spring management to (at least occasionally) look at all
the brood frames, and if necessary, reorganize the brood boxes.
What you are describing in your brood boxes seems to be what we call
"honey-bound." Not enough empty drawn comb for the queen to lay eggs in.
If not dealt with it can be a disaster for the colony.
What I found (surprisingly) this spring is that brood boxes filled up
with frames full of pollen. 15 or 16 in two medium brood boxes,
with the bees compensating by moving some of the brood rearing up into
the boxes we wanted them to put honey in.
In both cases the goal is to move the brood rearing into the bottom one
or two boxes by moving the honey or pollen frames up into the boxes above.
It's OK to move a honey or pollen frame that has a small patch of brood
up into the supers. House bees will care for them attracted by the
pheromones.
(when and if they fill them with honey you can harvest the honey and
either renew the foundation or remove the pollen, if they're plugged out
with pollen)
Put the nice brood frames in the middle of the bottom box(es) and flank
them by drawn comb.
If there are fewer than 7 brood frames, run one brood box until they
expand to 8 or 9 brood frames.
When there are 8 or more brood frames in one box, reorganize them into
the center of the bottom two boxes, and flank them with drawn comb
if you think there will be enough nectar flow to fuel the expansion.
If the dearth is just around the corner, they probably won't expand any
more, so leave them be.
Nectar flow depends a LOT on your neighborhood, the forage sources in
the surrounding mile radius, and the density of beekeepers competing for
it.
Neighborhoods in north Oakland and Berkeley are oversubscribed with
beekeepers, so the competition will be fierce.
If you have a neighborhood to yourself, your bees may find enough food
to continue expanding.
That's my 2¢
jerry