There is no point in getting angry. EA will not respond through this channel. Only an occasional "standard response" with not so usefull advice. The best you can do, is use Google and read a lot.
I got my wheel and ffb working after unplugging everything and only connecting my wheel. Payback all of a sudden recognizes my wheel (G27) and it all works. Unfortunately no remapping of axis or buttons.. But at least it works.
As for the sensitivity: there is a in-game feature (hold arrow on controller/wheel down) where you are allowed to change the sensitivity of your steering. It helps a little. But most of the times you must resort to drifting to make the sharper corners. Good luck with that, in the beginning of the game when your car doesn't have that much power.
The best you can do is install x360ce. Which allows you to program your wheel as a gamepad. And also allows you to set the sensitivity and speed al lot sharper. Only... I didn't get the ffb to work on my wheel. Others claim they could, but I tried everything and still nothing. I made due with the center spring in profiler. Works well for me.
Hope this helps you a little.