Eartip doesn't fit left ear

I bought Dunu S&S eartips. Tried all sizes, I have a great seal with M for my right ear. For my left ear, I can't get it comfortable. I think my left ear has kind of a weird shape. What should I do? Is it better to use stock tips (SM4) for both ears or stock for left and S&S for right? Or any other recommendation? Thanks!