Ok, if you're talking about other folks hearing wind noise from YOUR headset, not much can actually fix that without about 3cm foam surrounding your microphone portion. You'd look rather, um, 'dorky' like that. You've probably seen the boom mics on camera systems with the big furry wind block, same effect.
Almost every headset in the world will be plagued with this. Nature of the beast. Some are better than others. JBII ok, JB I, not so good.
Averysound can probably make the impression but they'll send it out to a fabrication laboratory that does the actual cutting/die/or whatever it is they do. The impression takes the mold of your ear, but that's NOT the actual material they make the headset out of. I'm sure the lab takes the impression, makes yet another mold and uses computer controlled milling machine to make the actual hole and such. On the final piece, I suspect the only thing made by "hand" was my original mold and them inserting it in the baggie.