FWIW, on Saturday we ran ToughBox Minis in the 5.95:1 configuration with a six wheel center drop, configured with 8" pneumatic wheels.
Notes:
1. We paid close attention to chassis balance
2. Center tires inflated to 40psi, outside tires to 10psi
3. The tires are the AM-3351 ribbed tire (no longer shown on their site, similar to
these
I agree with MetaEngineer that you should have some pretty hot motors on the drivetrain if you're dissipating that much current during a match. After running for a bit, you could carefully touch the things in MetaEngineer's list to see if any of them are hot.