The stock ESC and motor in my SC10B worked fine. Either something is wrong with your ESC, or the motor overheated really really badly, or the throttle settings are messed up on the controller.
The heat thing on the esc is impossible, it barely gets warm. I has an enormus fan. I treated the motor really badly, got it wet, lots of loose dirt, probably overheating (i measure it by touch, if i can't touch it for more that 2sec i consider that ut has to cool down).
Anyways, it has to be replaced.
Really surprises me how the velineon 3m system is holding up in the MERV. I overheated it like a champ and still gives me awesome speed and smoothness.
Little q: Do more amps give more "torque"? Cause i recently made a homemade little drill and i used a 5v 0.1 amp old cellphone charger to power it and it had awesome speed but the moment it touched the wood...it just stopped; so i changed to the 3.7v li-ion batt of a blackberry and although it has less volts, the drill now does holes easily, and from what i know lithium batteries deliver really hi amps.