Maybe try giving them all a gentle shake to get the yeast back in suspension then giving them a few more weeks. My oatmeal stout seems to be having some problems with carbing but they've only been in the bottle for 2 weeks. It also sat in secondary for about 3 weeks. So, i'd imagine the yeasts are a little tired. Maybe with some excitement they'll finish up the job.
Oh yeah, are you familiar with the bar Piper Down in SLC?
Reason: forgot to ask question.