"Plumbing a Jegs AOS in line into mine has worked. "
This would be a great way of being able to check the volume of oil being passed by the AOS. Useful if you think it is beginning to fail.
If you want something more OEM looking ,perhaps one of these ?
Oil Catch Cans
But the critical part IMHO is -how ,exactly did you connect it? What fittings and where ? It looks/measures as if a 3/4" line would work.
We are not alone with this issue.The BMW guys have also fitted oil separators:
My CVV (Oil Separator) DIY Journey in Pictures - Bimmerfest - BMW Forums
Lots under "catch cans" on Fleabay. Need one with AN12 or 3/4 or 20mm fittings, perhaps 5/8"?
This might work/ The orientation of the fittings is convenient.
http://www.ebay.com/itm/SHR-Tru-Billet-Universal-Oil-Separator-Black-/221738029620?hash=item33a09dd234&vxp=mtr
http://www.silverhorseracing.com/shr-tru-billet-oil-separator-universal.html
http://www.stangmods.com/JLT-Oil-Separtor-p/01369.htm