This is to ensure you've got adequate stores in the top deep and the cluster in the bottom deep before winter? Interesting idea. Are the deeps you'll put in as the tops going to be already drawn? Are your queens going to be marked so you can understand if the reduced laying space encourages swarming? I too have had hives that seem to start the winter out higher in the 1st deep than they should be only to see them "chimney" up and freeze in a cantaloupe size cluster with honey all around them, but none above. I assume you are trying to void that? 40 colonies are enough to be statistically relevant, whatever you find.