I have an inflatable back cushion that comes with a belt. I blew it up slightly, just enough to fit between my back and the restraint when it came up. I wore it under my shirt. I also leaned forward a bit. I don't know if it was psychological, knowing that I had comfy support, or if it really helped, but I was fine. I also took Bonine, wore seabands, and some other patches to prevent motion sickness. I leaned into the ride and whooped and hollered. I also did not eat a heavy meal before it. I might have taken some Advil too, I don't remember! I just know that I loved it and my back was fine! OTOH, when I rode Pirates the next night, I was totally surprised by my back's reaction to the small drop in the beginning. When the boat hit the water I had what I call my scary back pain. Another ride to put on my Do Not Ride list.

Anyhow, there is no way to predict how each person who deals with chronic pain will react to this ride. I posted frequently early on in this thread as I was trying to make up my mind whether to try it or not. I'm glad I did try it, but I may not ride it again on future trips because it involved so much preparation! ( plus my back can be unpredictable) Good luck!