ok, put the radio on hold and buy a servo! You might think the servo you've got now is good enough, but once you get a high speed, high torque, good centering servo, you'll wonder how you survived without. I'd check out HiTec servos as they've got the best warranty in the business. I personnaly use a JR ds8417... .095 speed, 93oz torque, at 4.8v. VERY good servo, metal gear. It was about $100.