Well, heck. You are doing everything I would recommend as my DD is part Touchy and seemed to need to scream before every sleep for the early bits of her life. I would just be sure that he is not being left, even if, as you say, your presence doesn't calm him, that he knows you are still there, incase he DOES need you. Does just sitting in the room with him repeating sleepy phrase do anything? Your routine looks good, and honestly, if he is going out that quickly and getting through the night OK, then I would just keep letting him know you are there and hope he settles out of some of the screaming. It can get old I know! I am trying to remember when DD stopped this and it may have been around 8 months or so.