Oh nice, thanks. Glad to know I'm not the only one - seems like the Flux silicon tips are just made out of some crappy silicon with no friction or something.
Do you have any idea which size I might like for the Klipsch tips? Are all mediums roughly equal? Annoyingly it seems the only way to buy them is to get several pairs of the same size.
They are roughly the same size as Klipsch oval tips.