what kv is the motor? kyle has ran the eflight park370 4100kv with 11t, and it was fine. make sure all your links are ok though, i once had a link popped off, it wasn't pretty, however, i landed it due to it being upright in the first place. i'd say again, lube your head, with higher headspeed, the centrigue force will be higher, and there's a big possibility that the hub and the rotor head (where it slides up and down) will bind due to the higher torque (hub want's to spin but head doesn't due to drag of blades). this will make the up and down motion very unsmooth. the servos should be ok, adn i doubt it's drawing too much current and didn't left any for the servos.