With respect to the question of uneven development, the 3000 Expert series Very Large Format film drums (for larger than 8x10) differ from the 2800 drums only in the way the NON-EMULSION side is processed. ( see JQ9502 "3000 Series (Very) Large Format Sheet Film Drums"). In my 2800 drums, the few ridges behind the film don't actually touch the film, and have not been a problem, even with 'in-tank' washing.