Not Ranked
I'm just looking at the lever arm that the radius of the steering wheel represents. A force has to be applied at the rim normal to that radius to turn the wheel. Going from a radius of 7.5 inches to 8 inches equates to a lever arm that is 1.0667 times longer. Say it takes 20 lbs of force at the rim to initiate movement the reduced force should be 20/1.0667 = 18.75 lbs of force now. As long as you are using 2 hands in both instances, the effort for each hand is basically half or the 20 or 18.75 lbs.
Going from a 14 to a 15 would be a very slightly greater change. If Dwight noticed a significant change going from 14 to 15, you should notice pretty much the same going from 15 to 16.
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