I had ear molds made (at the time in Denver, I don't remember the doctor's name) for the Lightspeed Mach 1 headset and I was never able to get used to having a mold in my ear. After 30 minutes or so my inner ears would get really sore and sensitive.

Maybe the molds were not very well made, I don't know. But now I don't ever use the molds. When I use the Mach 1 headset I use the no roll foam ear plugs that come with the Mach 1 and they work great.

Just my two cents. If you have molds made, I hope you have a better result.