Hello, I just got a new 2015 S Plus last week, I love this car but, after driving a few miles my back cramps up and hurts. Lower back and up about 4 inches, not good, it is making my new car experience a real pain. Have any others experienced this problem? I also have a 2013 Prius and the seats in it fit me great. I am hoping my back will adjust to these seats or they will adjust to me. I am 6 ft 2 and weigh 215. I am not small but not a huge guy either. I am trying a small blanket folded up to make it a little softer and raise me up the where the lumber actually fits me. As stock it feels like I my tail in in a hole, slopes to bottom rear. I hope someone has some input that has experienced this issue too?