Off the shelf stuff fits fine for gym, etc. But even with adjustable molds, I can't get anything to stay put when I run/get sweaty.

Any suggestions?

i switched to the shokz open runs a few months ago. i felt like my hearing was getting a little sensitive; seemed like not piping the jams directly into my earhole might better. for my use, they're great.
observations:
- not as loud
- can feel vibrations w certain tunes at certain volumes
- strap/band is unnoticeable
- your ears are still open so you hear stuff (traffic/conversation/etc)
- battery life is good

+1 for Shokz

Have the open run pro and the open swim