sorry i hope i'm not misunderstanding but you molded the it with the DOUBLE FLANGE eartips on the 8320s? the mold went ontop of the silcone tips?
i saw your link on regard the double flange on buyincoins a few pages early(probably 10 pages back now)
also i noticed something about the 8320s not sure if anyone pointed it out..
but i don't think its possible to have maximum isolation on them anyway... disregarding the shallow nozzle
the part on the "face" of the 8320s where the 3 screws are on have little vents on it that air (sound) can seep in.
along with the fact that the nozzle is short and the port hole next to the nozzle, i don't think it would be good for commuting ( too many sounds would seep in)---> thats only if you want total isolation
i also used this video
in the video if you watch closely, the nozzle had nothing blocking it, and he just shoved in in the mix, without damaging it ( because i image the compressed air inside the earphones prevented any of the mix from getting in... -- > so no vents= no mix leaking inside
but for home use.... oh my thats a completely different story
oh and when you said u used 1/4 did you mean 1/4 for BOTH earphones = 1/8 for one and 1/8 for the other
or it was 1/2 a max and you split the half= 1/4 for each?
i followed this for my mold.. but instead of using half for each ear i used 1/4th for each ear,,, and i used a double flange and not a single like in the link... http://s185.photobucket.com/user/jaejw1/story/10901
that youtube link i have watched probably 20 times or more... but there is an actual link where the OP talks about not using a cover for the nozzle and how he had a hard time getting the silicone out... if im recalling it correctly..