Seems to me there is a another side to the "twitchy" argument.
Most of the in-car videos indicate about 30 degrees of steering input for corner entry on an oval. (10/2 position moves to 9/1 clock position) That means for a 13.5 inch wheel, your hands move 3.5". For a 15" wheel, your hands move the same 30 degrees but now they have to move 4". For an 11" wheel, the hands move 2.9". I guess if your brain tells you hands to move 4", then you would oversteer 1/2" with a 13" wheel and 1.1" with a 11". But, 2.9" is a lot of distance---if you use a mouse on a computer you get used to moving your hand with precision with much less than 2.9" movement.
Now, to me "twitchy" means a lot of hand movement back and forth is needed to control the car--particularly on dirt. I see in the videos as much as 60 degrees to go from normal input to a "correction" movement to compensate for the back end sliding out too much. (loose). So the other side of the analysis is that the bigger the wheel, the more your hand needs to move in order to make the correction. A smaller wheel enables much faster and easier "correction" inputs. If the car needs a 60 degree change in steering input, with a 13.5" wheel, your hands need to move 7" in a split second. With an 11" wheel, only 5.8". With the 11" wheel, your hands reach the correct position 18% faster.
We get used to driving cars and trucks with pretty big steering wheels and if we get into a race car with fast steering and a small wheel, it is normal to make inputs that are too large...at first.
I had the same problem when I first took flying lessons---I moved the yoke way too much and my instructor kept telling me "apply pressure--not movement". That "apply pressure--not movement" can be translated to "don't move your hands any more than necessary to achieve the desired change in vehicle direction". A big wheel makes this easier--so the learning curve is faster because it is easier to avoid moving the hands too far. It is probably more "comfortable". But, later the "slower" input becomes a hindrance to performance as it take more time to make "corrections".
Some would say that a "twitchy" car needs the fastest steering possible (without undue physical force and effort) so that hand movement is minimized. And avoidance of "oversteering" is just a matter of getting used to and adapting to the faster steering.
