I used to have the same problem, I hate to say it but when i switched to Whiting hackles my problem went away. In my experience, the recent Metz hackles have too thick of a rachis and they want to twist too much. On the other hand, I also have some Hebert Miner Whiting capes that may be a bit thin in rachis (they break a bit too easy). I have found I prefer standard Whiting capes (red packaging) for my tying needs.