E.S.
My twins a girl and a boy did the same thing. I remember doing the same thing about inching out but I didnt think it was anyones method but my own.
Screaming I know all too well. They just seemed to want to scream and indeed my daughter would set my son off. The wold scream in OR out of the cribs so I figured they might as well fight sleep IN their cribs and indeed eventually would pass out. I tried rocking and patting their backs.
I did also play music that did help. A LITTLE All kinds of music. Also story tapes.
I think it lasted from about a month or two.
Mine will be 26 this Sunday. Grace and Peace