Never used the regular redding FL dies. Got a set for my STW. But the expander ball/decapper is off center. You can't raise these expanders up very much like you can a RCBS. When I roll the die the expander wobble real bad. I would think this would cause runout. Haven't used them yet. Only Redding stuff I got is competition die sets, which I can tell you are top notch. Rest is RCBS and Lee.

Need to return those where you bought them , maybe they sold you factory seconds

Naw, I doubt they would do that. From what it sounds like this is pretty common for em. If it is, I wished they would thread the expander rod all the way down so I could raise it up all the way.