BEC vs Rx pack?

[snowhack]

All that being said right now I am running my MM in my XXXT. The set up is

...Mamba Max w/ latest FW, no fan yet. (9v c/o and factory defaults)
...TRX Velion 3500kv BL motor, no heat sink/fan.
...FM radio. (my 8T has the Spectrum)
...(2) 11.1v /3s /2200mAh /25-30C Li-Po's (Parallel for 4400mAh.)
...86t spur/19t pinion.
...sans wheelie bar. (has more wear on lid than tires)
...2.2 Yakahamas. (all arround)

I do not presently use a BEC or Rx pack, am I taxing my servo?