My experience is very similar to BernieBees. It takes some management to persuade the bees to use the Flow frames. I've done the split brood chamber trick too. One oddity was that the bees left dome-shaped space for the queen to lay, but then subsequently backfilled it. See the tinyURL below. I've never seen a queen lay in a Flow frame since day one.
https://tinyurl.com/5bf8suw9
> We build up a hive to 1 Deep and 1 Medium (Med: primarily drawn and maybe with some brood). Once we have this, I split the hive using the FlowHive super. This causes bee traffic across the super. One of the hives started to use the FlowHive super.
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