[nitrostarter]

I would slam it and stiffen the spring/oil rates. Then adjust your camber/caster in the fronts to have 0 caster and camber. You want good contact in the front to provide traction and tracking.

In the rear I would look to some toe-in to help keep it going in a straight line. I would lower the rear but not slammed. Again stiffen the spring/oil.

I would look into some 17mm adaptors and find a set of GRP Rally premounts. These are the same as Losi rally tires which are now discontinued.

What motor are you running on 6s?

My choice would be a CC2650 on 6s for 1 or 2 passes only and then let it cool down.

What lipo are you running? I would also preheat the cells with a heat blanket or heater to about 105*F before the run.