EarFun Air Pro SV ear tip choices

Hi.

I'm a new owner of the Air Pro SV ear "buds" and wonder if any other owners have found alternative eartip choices for them.

This is my first set of this style of bud and I've tried all three of the sizes included by EarFun.  I've settled on the large tip, but I never seem to get a very secure fit in my ears.  The L size is certainly a tighter/better isolating fit than the S or M size. (FYI-I am very used to my wired set of iem's which require relatively deep insertion.)

Any advice would be greatly appreciated.

Thanks!

Charlie