Same issues here, i have found a few workarounds but so far nothing constant.
a) Send to Audition – audition export OMF. I had good success but not perfect. The good thing is that with this it works or it doesnt. You dont get the ”missing 40files” that omf export out of premiere sometimes does. Audition nails it perfect or you get 1400 missing files(everything).
b) XML export to FCP 7 – FCP 7 OMF. This works fine but it hasnt been superb. FCP 7 nails omf relatively well but i had many issues over the years.
c) XML export – load xml in audition – audition export. The omf seems successful but loading a 45 min timeline of .mov audio in audition seems to crash it on a regular basis.
Sadly.. nothing perfect so far… Next Premiere CC update(8.0.0) is supposed to improve AAF exports(which are horrible in Premiere).