Umm, no. You got that backwards. Ever wonder why cars drag racing are faster at sea level than at elevation? More dense air.

Vehicle servos have forces put on them as well. It's more than just turning the wheels stationary on the ground. I want my servo to have enough power to keep those wheels turned while hitting bumps/rocks/ruts/jumps, etc. I also want it to be able to do this with a servo saver that isn't so loose that said bumps steer the vehicle for me everytime I hit one.

Keeping the servo saver tight and precise requires a servo that is strong so that it doesn't get stripped out, and keeping those tires turned to the position I want while the vehicle is getting all those forces put on the tires requires some torque.

I run an XP1015 in my RC8Be and feel it's a good mix of power and speed.