I'll start off with this, when the stock is placed on the rifle the only two things come to mind that could interfere with bolt carrier movement; those would be the recoil spring/rod and the buffer plunger on the bolt carrier.
Try and eliminate one of those suspect items and see what happens. Easiest would be the recoil assembly. Take that out and see if you get any further travel on the carrier.
Also, find a hard surface rest the plunger on said hard surface and push down on the carrier and see if you can push the plunger into the carrier. You'll have to push hard as the spring is pretty stout.
The buffer on the carrier is not normally compressed when you cock the rifle so I doubt if its that, but just a place to look.
Good luck solving your problem.
Pictures and range report on your rifle once you do.