And tick the box for in game effects yes. You will notice that it works a lot better on dirt than on tarmac. FFB was never fixed properly unfortunately.
I don't play with a G25/27 anymore. So i can not give you actual feedback of how it is now.
And remember i'm probably a bit stronger than average, so maybe those numbers are on the high side. You can always drop the overall strenght to 120 or 100. Or start at 100 to see how it works and add some more if the effects are too weak.
Those settings are just pointers for you to find your own good setup. Some like to add some speedfactor to make the car less nervous at high speed for example.
I used to play at 720 degrees before, but the game reacts better at 360. Some even play at 270 degrees.