I recently got the Therma Rest Neo Air X-Lite and have found that as a back sleeper, it doesn't really work for me. I have tried all levels of inflation but I still wind up with my lower back arched and don't sleep very well and am pretty sore the next day. I would like to know if anyone else has had this problem. Since the Therma Rest has horizontal baffles, I'm wondering if vertical baffles would make a difference or if the individual cell type mattress like the Sea to Summit Comfort Plus would solve the problem. I will be trying different makes soon but just wanted to know if anyone else has had this experience and what, if anything, they were able to do about it. Thanks.