Have you tried to change AA-mode to Multisample AA in CCC? Some older games have problems with better AA-modes (Adaptive multisample AA and Supersample AA).
Logitech Driving Force GT was not supported in driver version 5.02. Driver version from Bunders link was version 5.02. Windows XP/Vista/7 support came with driver version 5.06 and from Logitech site you can download now version 5.09.
To me they look better without default shadows. And its easier to put driver name to the side of the car. I love those skins. Wonderful work, simple and beautiful.
I found several Gold Leaf Lotus skins from the forum and here http://www.bean0.com/?s=leaf but I did not found FOX or RB4 versions (size 2048). No need to shadows just plain colors.
If someone could do those two I would be very happy.