I imagine that you're refering to colony build up during the Spring which is basically what I've found by engineering a 'chimney' effect - given the opportunity bees like to go up and down. My own strain of bee is more than capable of filling a 11 comb dadant hive but they're quicker at laying out an equivalent amount of comb spread over a smaller base area. At least, this is what I've observed so far.
I may still take the plunge (not this year) of changing over to a one size box and allowing the brood nest to take a more vertical format.
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