Would an extra 2" of tread width help?

RockinRobin said
Sounds like that's the way to go. I guess I'll experiment with launch rpm and pulling timing when I go out again next year. No transbrake and leaving off idle should keep the spin to a minimum, but there is at least one track where drastic methods are going to be needed.
Are you still leaf spring? I am Calvert split mono, Cal tracs, Calvert shocks all the way around. Still using slant 6 torsion bars up front too.

I would try to make some rear shock adjustments first, if it were me, personally. Caltrac suspension is very popular suspension and still very effective. I understand your frustration. With your ET and 60’, I agree you should be able to hook it up just about anywhere. Before buying new bigger tires I’d try some of them knobs on the shocks, see where it goes from there.