This is what I have for wheel and pedals. I can use the Wheel but not the pedals. This worked before but not anymore. I uninstalled this game because of this the first time and I came back 4 months later to the same problem.
I also use a CSL DD wheel base and Thrustmaster T-LCM pedals and I haven't encountered any problems so far. I use the following settings: Have you installed Thrustmaster's TM SimPedals Calibration Tool and have you checked whether your pedals are working correctly? Sometimes it happens that the pedals are not recognised correctly by Windows. When this happens I have to unplug and replug them. Another guess: Maybe you are in compatibility mode (orange light on the power button) with your CSL DD. I have to use "normal mode" (I don't know how it is called; red light on the power button). Good luck to you that you'll find the culprit very soon!
I have the Calibration tool installed. They work correctly. Ill try using PC mode on the DD tomorrow.