Are you sure "notions of form" are the problem, David? Seems like say if you look at "Speech, Speech!" by G. Hill the problem he's confronting is one of diction & idiom. I think the deliquescence (supposed) of meter & form is inseparable from those "problems" - When General Jackson Posed for his statue He knew how one feels. Shall a man go barefoot Blinking and blank? But how does one feel? One grows used to the weather, The landscape and that; And the sublime comes down To the spirit itself, The spirit and space, The empty spirit In vacant space. What wine does one drink? What bread does one eat? from Wallace Stevens, "The American Sublime" [1935]