After contacting Forster yesterday I sent the die back to them with a couple pieces of fired brass to look at.
Maybe @tscustoms can comment on the reamer used.
It's not uncommon for the dies to be "headspaced" long. I don't know how many Forster FL 6Dasher dies we've buzzed .010-.015" off the bottom of because they wouldn't bump shoulders.
Almost all our barrels get headspaced at GO+.002", any proper set of dies should bump the shoulder at that. Not always the case however.