IF you are using sticks for steering and accel/deacceleration, it will be very sensetive, no matter how you set it, but there are thing that might help a bit...Set the lock value of your controller in LFS to 90*. Also, if you can, use less lock in setup...
But its still nowhere near to a wheel, even a cheap non ffb one...I quit playing LFS when my old wheel died, until I bought a new one, even tho I had a pad.