my mamba doesn't like to start from a stand still... i've tried all the different combos of start power but i haven't been able to resolve it yet... i'm hesitant to contact castle as i'm using it on a g2r revo on 4s with a plettenberg maximum w/fan... gearing is 16/51... i think the fact that the motor is 4 pole has something to do with it... once it gets rolling, i mean even just for a couple of inches, its silky smooth... but from a stand still it just cogs... i found that if i give it full throttle it actually doesn't cog... only problem is if there is any sort of grip, instant backflip... lol... btw i've got a fan on the esc and it doesn't even get warm after 15 min of hard running in a parking lot... the motor feels warm to the touch i would get around 80-90 F and batts are cool... i'm using apogee limn 5800's...