Im assuming it as meelectronics M6(You just mentioned M6 in the post). They are provided with small and large triple-flanges isnt it? (I got them both with my set)
I have the exact problem with M6, only small flange fits good, still it was uncomfortable for longer sessions and not much isolating. I tried experimenting the tips and large triple flange fits like anything for me, at first it was uncomfortable due to the wax in my ear, cleaning the wax and then inserting them was like perfect fit with great isolation. The Small Triple flanges there are too small and they often gets stuck in my ear while removing the IEM.
Also, Comply T-400 does wonders on these, comfort is just great and isolation too good , slightly lesser than large triple flanges.
Edited by hitme987 - 12/5/12 at 7:33am