Yeah I would agree. You can't have stump pulling torque, blazing straightaway speed, and battery conservation all in one package. We've run 10 minute mains before but had to reduce the lvc to 3.0v/cell to make that. That was running an RX8 on 80%, Revtech 4XS 3800, and 6600 65c packs.
Of course, those nitro guys didn't make 15 minutes without a stop did they? They probably had to top off?