The carbide "sizing" ring in the FCD swaging cast or coated bullets down to jacketed sizes is a well known issue.
Google "removing the carbide sizing ring from a Lee factory crimp die". There are plenty of different posts of people driving the ring out fairly easily...then you're left with a nice easily adjustable taper crimp die.
Another option is to just buy a standard taper crimp die from Redding, RCBS, Hornady, etc.