no, i believe it's not binding, is just that you have more positive pitch than negative pitch, (remember, he said the rotor speed slow down when full throttle) i believe it's more like you've got total positive pitch range that you've really stall the motor, i've got a futaba 7c and at first i set my pitch range to full mechanically posible, then realized that the motor will stall very badly. and do you have a cp or a pro? with cp ni-hm batt and cf blades will stall the stock brushed motor real bad. try to decrease your pitch by adjusting the pitch links, or the control rods to even out the positive and negative pitch. hope this helps.