Have you tried using short-stemmed and/or smaller than usual eartips for deeper insertion? I found that it helps a lot with the Semper's fit.
For OM I find that bigger tips work better. The big size and shape of the shell makes it difficult for deep insertion, but sits nicely and level with the ears when using larger tips. M's are usually my size but for R2 Aten M-L worked best and now for OM it's L size tips that do the trick. The seal is great, lasts for hours with no readjusting & I can talk & chew food and it still won't break.
Pink/Gold with Spiral Dots L.
I put all other IEMs aside and am only using the OMs nowadays, I want to go back to the days when I used to enjoy music and think less about the technical aspect or the age old question "how would this sound on X+Y equipment".