Excellent review! Maybe the issue about loosing the ear bud is related with your ear's morfology, considered that each one have a unique morfology, with different tragus types, is difficulty to find a product with a perfect shape, for me for example e like ear buds with a silicon point, I think adjusts better into my ear pit.
Oh, absolutely. The ultra-scientific head-shake test proves only that my ears are different between them, and the anatomy from me to others will vary even more than that. The “problem” here is the constant feeling that they are slipping from my ears, even when they’re not. That’s SO annoying! Anatomically speaking, you’re absolutely right though. Oh, and thanks, bro!