If you look at it from a 'head' pressure perspective, it seems logical that with a lower water level (less head pressure), the pumps are able to create a larger wave since they're moving less water. Not sure the overflow has that much to do with it, but I'm not a physics professor either!
When I first got my MP40s, I had fun playing around with the wave making feature, but am now content to have them run in a random mode. I only put them into wave mode shortly before I do water changes these days. Helps transport nutrients. Wave mode gets too noisy & annoying to use continuously. Livestock doesn't seem to care either way.
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