As I replace comb I would like to have some new comb for checkerboarding. We have only one flow and it is from late march thru may. As you say after the flow they pack it all in the empty space. Since I run two different size boxes this means my brood space gets filled and the queen becomes honeybound.
Since I run shallow supers I can not have them draw the frames in the brood chamber, remove them and allow them to rob them out. Having drawn comb has been my nemesis in particular after I lost some stored frames to wax moth.