[Mr Incredible]

So I've tried many different brands and kinds of universal IEM's and they all seem to fall out of my left ear. I've very active while wearing IEM's so I need something that will stay in well, and isolate well, and to top it all off my ears start to hurt after a few hours of universals(sometimes I have to wear them for 10 hours strait). So I finally decided that I'd look into getting some custom fitted ones, but I'm not sure which ones are best. I like bass, but I also like highs. I currently own some Ultrasone HFI-780's and I really like the way they sound. I highly dislike the sound of ety's. Right now I've looked at the Fidelity Customs and the Hearyourself.com's. I'd like to have removable cables. If theres any other brands, or if you can give me some insite on the sound signatures of the above mentioned would be very appreciated.

 

[ac!d-rxn]

I am shopping around for something similar and was shown this:
Alien Ears Friction Molds
They will create custom molds for your universal fit earphones at a very affordable price.
You didn't mention which IEM's you own, so I am not sure if its an option for you, but I figured I would mention it anyway!

 

[Mr Incredible]

I'm currently only using CX300's but thats because I haven't found universals that stay put good enough, so I haven't spent any money on them.

 

[[benz]]

Whatever brand you choose, stay away from single driver custom IEMs. I have one, not satisfied and I'm considering an upgrade.