I test drove a 4c with leather seats and they were very comfortable for a 20 minute drive over rough roads. I just got my 4c delivered and after driving it for 10 minutes my back was killing me. The standard seat backs are concave, the opposite of what I need. The only mention I saw on the forum of this was a guy ordering a lumbar support. Do the leather seats have lumbar support or did I hallucinate on my test drive?