I run all mediums and do not use excluders. During the spring build up she will lay in the 3rd medium for a while then when the strong flow hits they back fill the thrid medium and push her down to the lower two.
This is what I mostly see. I do have a couple that keep a bigger brood nest and continue to maintain brood in the third medium. I just let them decide what size brood nest they want.
This is what I mostly see. I do have a couple that keep a bigger brood nest and continue to maintain brood in the third medium. I just let them decide what size brood nest they want.