I've tried all 3 sizes for the buds. After numerous minutes (using the large) I can finally get one fit correctly in my ear. After several more tries I finally get the other to fit properly, but when that happens the first ear fails the test. I rarely get both fit properly at the same time. When I do, I will test every several minutes and eventually both end up failing. I cannot get a pass and keep it.
Happens all the time. I know I have a good fit because there is no leakage of outside noise when using ANC. I gave up trying the Fit Test because it will drive you crazy.
I just bought some diofit brand replacement tips for my Buds3 Pro last week (from Amazon). They have an extra silicone rib, and fixed the exact same problem you (and I) were having. They're a little expensive, though, but diofit is one of Samsung's trusted suppliers in South Korea. They're about $20 including tax for 4 tips.
