Adapting setup to less-than-ideal tires

[KickMe]

Hi X-family,

In two weeks I'll run in the CML offroad masters, an indoor carpet race near Paris. Some of the best French drivers will try to compete with English guests Tom Yardy, Keith Robertson and Neil Cragg.

The race is sponsored by CML, so the mandatory tires are Fastrax Turf Rippers. From what I heard, we will probably miss our Schumacher yellows a lot during the week-end (that was the most polite way of putting it).

Have you ever tried these tires? If there really is a motricity problem, should I use parts of a dirt setup, like raising the gearbox? Or should I keep my base setup and concentrate on my driving?