I'm so sorry you're having such a hard time right now! Cheryl had some really good advice for you. I highly recommend starting a swaddle, if you aren't doing one already. We used the Aussie swaddle (line below) until Tyler was 7 or 8 mo old, and it was a godsend. He'd do the same jolt when he hit the mattress, and the swaddle really helped. It took a lot of tinkering before we figured out how long to keep Tyler awake (and of course, once we thought we'd outsmarted him, it would change again). He just didn't have an off switch, and the window of opportunity for putting him to sleep seemed to be pretty small. I think part of it was developmental too...one day, it just got better. Maybe because of all the pat/shh I'd done, maybe not. Who knows.
PU/PD didn't work well for us until he was older, and we had to modify pat/shh to work for us. The patting wound him up, and as long as he could SEE, he'd get too stimulated to close his eyes unless the room was pitch dark. He was a back sleeper, so we'd rest one hand on his chest or thigh and use the other to shield his eyes to limit visual stimulation. It made a huge difference, and as he got older, we were able to wean him from our pat/shh.
Also, we had to give up the bath around that age. It just wound him up. We started doing it during the day instead. We still can't give him a bath right before bed!
Those are just a few things that come to mind right now. Please, please keep us posted and DON'T GIVE UP. It takes time, and you're already on the right track, so please hang in there!