Well interestingly the hive I see the most washboarding in has two colonies/queens in it. Each colony/queen only has 5 full depth Langstroth frames of laying space in a 10 frame Langstroth box. The brood pattern was extremely dense (right to the edges of the frames) when I last looked.
Planned to get video of them washboarding on bricks… but over the last week or so they have become fairly defensive… so will suit up to get the video 