I've got a 32" waist, and they offer me no support at all. I slide around in them, and can't ever seem to get comfortable. The side bolstering was designed for someone of a 46" waist, and the kidney supports the same. The seats were just designed for huge fucking people, not for me.
And I understand designing the seats to fit the market. But still, they're uncomfortable to me. I loved the seats in my EJ hatch.
You are going to get that in any new car, sans something really sporty. The average American is a fat ass. I know it would be tough, but see if you can find some seats from a jdm Fit/Jazz. They will fit better. When I had my old EG hatch, I swapped out the stock seats for a set of jdm eg6 seats. The cloth was better, and grippier, and the seats hugged me more.