I don't own the X6, but it is usually described as darkish sounding with good quantity and quality bass.just tried my first set of buds to see if the mx500 fit still works for me and I'm glad I did because they don't fit that well. the left bud keeps falling out. jim offered to send me a bell shell to see if the fit works.
as an aside, I bought a set of yincrow x6 to see if the mx500 shape works and also they were well reviewed so I thought I'd use them to give "hi-fi" buds a try. I must say they don't sound very good at all. weak bass and peaky highs. my airpods 4 sound much much better. not sure what I was expecting for $20 but I'm hoping the tgxear stuff is far superior...
Do they fall out because your ears are too big, or is it because of the somewhat big and wide stem?
I suggest not to dismiss the X6 just yet... Not only because they don't sound good to you now, but because this shell type is very widely used. I had a very similar problem in the beginning when I started on my earbud journey. You should try some silicone rings under the foam. There are two types.
Get both, the invest is not too high and chances are you will need them for other shell types too. Having both types of silicone rings around will help with finding the right fit for you and fit is absolutely crucial for earbuds. You might end up using the smaller type rings on one shell and bigger type rings on another shell type.
Here are the links to the Aliexpress articles:
bigger rings
smaller rings
Good luck!

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