Wider will take away some traction, while increasing stability. Narrower, the car will roll more and "dig" into the corner more. That's kind of the mega cliff notes of it.
The production of the new wheel hex spacers just came in today so we can test the cars tomorrow at max width to see the effect of a wider car. While not the same as making the hinge pin position further out, it will achieve a similar effect. My feeling is that the car will react a bit slower and become a little more sluggish.