I was never a fan of caster because it sort of tilts the chassis when turning. I didn't think that was good for a prep drag car. Can't tell it was better but it didn't lift one side of chassis is turning. So when I started with no prep, I built my stretched bandit with 0 caster. Worked fine. When I went to a conventional stretched bandit with caster, I didn't notice a difference.
I hope you can find out something so I can understand it too. I'm assuming you just have to avoid bump steer and keep the Ackermann good.