Call Mec and talk to them . They are very good about helping with problems with adjustments on their loaders .
Had the same problems with my Grabber when I first switched over to the AAHS hulls . Took a lot of very small adjustments to solve the problem . I still get a bad one every once in a while .
Those hulls may not be wasted . Shoot them and they may crimp fine the next time you load them .