When I was searching for an SL, I came across a 2013 with with the carbon seats (like you have). I found even though the seat only moves front to rear, there is an adjustment for recline. If it is the same on your car, you can unbolt the front mount of the seat and there is a second set of mounting points for a little more "rear tilt". Hope this helps, maybe you can make the Carbon seats more comfy ???.