The duckbilling is associated with the super.....I personally don't have a problem with the duckbilling..minor flaw........I don't know how common the kinking is...there are plenty of picts out there of perfect, non-kinked, no duckbill, solid black beauties.
I've never heard of any issues with the Black Pewters......here's an old pict of my Black Pewter male with one of my Black Pastel females...