Lot's of bees means that there was a lot of brood to feed. So instead of all that honey being stored, it was used to build comb and raise brood. Hot weather usually means not too much of a flow. That also means not much honey. Not much to do, a hive full of bees and hot weather often brings about bearding. It all sounds pretty normal to me but I'd check for ventilation and space above the brood box. You really don't want it swarming in August.