Well since you say they are "GS" I'll ask if they are gas powered too? If so, you crap out on several points buy using those servos which are not recommended for gassers or anything over, IIRC, 11 lbs. Horizon had lots of grief with those servos and the Spektrum DS821 which is the same servo, when they started inlcuding them with radio sets and people didn't bother to read, or didn't believe the warnings. Vibration, fatigue and the output shaft snaps off....

As for me, my current favorite throttle servo is a Hitec 7985. Digital, MG, high resolution, programmable and pretty damn fast. Works great on the gassers.