I did ran in the Belgian-Dutch-Championship at STokrooie yesterday and this was exactly what you described: dusty dirt track with lots of bumps and holes in the track.
Things I changed from the standard Kevin Lee setup:
front:
shocks: oil 35, spring red, (! see Kevin Lee: 3mm shim in the shock, 14mm shaft showing, ...)
short pushrod-mod, with pushrod-turnbuckles showing 20mm
rollbar in the softest position
height: (forgot, I'll check tomorrow)
Rear:
no precompression-spring,
red spring
height: A-Arms horizontal (axles above level)
shock mounted in lowest hole on rocker and mounted in standard hole on shocktower + 18mm shwoing of shockshaft
no rollbar
My mate Phoenix drove a slightly diff setup:
Caster: 2mm shims in front of top suspension arm (I ran full caster: 4mm shims in front of top suspension arm)
no front rollbar
We also both drove with the solid cardan axle (no one-way)
hope this helps.
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