Locally, we have been pretty lucky... You could always get powder as long as you were willing to pay and not picky for Unique or Varget.... But even thats starting to pop back up for cheap again.
Id take a comparison of the breaks on the ramp and edge of your old barrel to new, see where it might be majorly different. Polishing the ramp never hurts.
That's such a weird issue. It's sad it came to that. I was just thinking of sending mine in to get cleaned up and tuned, maybe I'll pass if it could lead to drama... Ugh
I found grip does everything... My old grip was all over the place, but I took an idpa class and changed it to a left hand vice grip with my wrist bent more, and my groups tightened up like no other.