110ft/s (75mph) robot design

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Originally Posted by Aaron Ng

By limiting the amperage for each cim at startup to 40, and then bumping it up to around 50 when shifting to high, it can reach 75mph without the 40 amp snap action cim breaker, or 120 amp main breaker popping. It comes very darn near to dying, but it doesn't.

Can you explain how running 6 CIMs at 40 amps each will not trip the 120amp breaker switch after a few seconds?

Did you use the JVN Design calculator to figure your expected motor currents with that configuration? Although I don't have the other specs that I need of your design (wheel diameter, weight on wheels), I did some guessing and the resulting "pushing match" current (in this case accelerating from 0) runs up to 152 amps per motor.