2. More Flare. I will have to go back and give this another try. My experience has been simply that I get good rounds and then all of a sudden, a bad one. So, in the past when I give it more flare, then the bullet just falls into the case with a little push of my thumb. I don't think I can get this to work but will try again.
That is the classic sign you need more flare! Cases vary in length and thickness. If a short case or thin case comes through your process, blam you will have a tilted round. Add some more flare and then those cases will have enough flare.
Too much flare is a case life issue....well, you pick them up off the ground for free likely, so you might lose a couple to flare...who cares!
It could be over sizing. I that case an M die has a real expander and could help as it will loosen the neck up a bit.