Well...

I use the Steering Linearity at 87% for every track except for Coca-Cola, Super Speedways and Road Corses - so I'm like you on that.

Steering Sensitivity on 0%? Oh well, I am not sure if this would fit me. I was always used to drive on 50%, and bringing it down to 33% was already a big step. Of course, that goes from different driving styles. If it fits you and your lap times are not worst, than you can assume that it was a positive change. About the Deadzone at 0% I think it's OK to use it. I always drove with Steering Sensitivity at 50% and Deadzone at 0% - so from 0% to 2% was not a big jump.

For me, the setting posted above really fits me. I don't think that 0% for both there would work better for me, honestly.

Also, are you playing Road Corses or Ovals? Settings might be different for each kind of track. Sometimes when driving Ovals the Deadzone at 2% wasn't fitting me cause the car reaction was too slow - you know what I mean.

In few words - if you feel good with the configuration and it doesn't affect your lap times in a negative way, that's perfect to use and recommendable, of course.