Had the same issue with my Faxon barrel and got the same response from them on the PTG reamer. Ran a throating reamer as the chamber itself was good and the problems were fixed. If I had to do over again I would choose the JP barrel as I'm running their bolt.
Found this posting from cking and its worth noting again: "Problem isn't a short chamber it is a short freebore/lead, drop a round in the barrel it should stop on case and spin freely if not, you bullet is hitting the rifling, Use a Clymer 9mm reamer it has a long lead freebore, careful to use a reamer stop you don't want to cut the chamber deeper."
Just note, Faxton's barrel are now coming with 1/2-28TPI threading so make sure you get the appropriate 9mm muzzle device.