I haven't experienced it but it does sound like a lack of servo power as you mentioned.
Personally I would try swapping out the servo to something more reliable (I've had nothing but bad experiences with Hitec servos). Also, a high-torque digital servo like that is going to be quite heavy on power anyway.
The Novak speedos tend to give quite a good power output to the servos, so if swapping the servos doesn't work, you might have to run a receiver pack, or try swapping the ESC just in case it is faulty.
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