The speed runs are not their primary deal (except for the monster) - John runs road course with it.
Caster is not very adjustable (usually derived from a dynamic AE kingpin front end) and toe-out is a recipe for disaster on these - stability is from toe in, not toe out on our cars.
All that said - he's likely squirrelly on that run because the surface is dusty - it looks like he can't get rear traction.