i'm no expert but
* softening the front will make it grip more ... If you want to loose grip in the front, I should use a stiffer spring and/or thicker oil, not the opposit.
* Also more body-roll will make the car have more mechanical grip. The car will "push" more to the outside-wheels, giving those wheelsmore grip.
* Also, a roll bar on the FRONT will make the front less roll and thus softening the grip and response.
AFAIK, rollbars aren't used if the track is very bumpy. Astroturf-tracks overhere (Belgium) are very smooth (although with significant jumps) and so we use rollbars on them almost all the time.
If I were you I would use a rollbar in the front if posible, make the front suspension a bit stiffer and not softer, and cut the first outer row of pins on the rear tyres, as this gives the car more sliding and less grippy in the corner, and on Front tyres: cut one row on the inside and two or three rows on the outside
Please correct me if I'm wrong
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