I have similar issues... to keep from having the ear loops skew the proper seal by their stiff nature, I have to cinch up the chin slider right under my throat. That keeps it all secure, but whenever the chin slider starts to creep back down I have to tighten it again. Kind of a pain, but it works in keeping the seal.
The seal isn't quite a problem for me. It is just that even with a seal, the isolation is quite below average for an IEM. I wonder why.