Same here. We got a 2013 SE 2.5 with power driver's seat about a month ago, 68,000 miles on it. My back starts hurting really bad about 10 minutes into driving. The seat feels sunken in, like I'm sitting in a bowl. I'm 5 foot 6 inches and 155 pounds. Like you, I've tried adjusting it every way it'll adjust, but nothing helps. Does anyone here know if later models use this same seat? Thanks.
Mike Fields