What ESC are you using? Ive had problems like this before and its down to the ESC not supplying enough power via the BEC to make the servo work properly. Ive had it happen with mtronics brushed ESC's and a cheap LRP brushed ESC but not with any of my brushless ESC's.
If it is that I don't think there's much you can do about it. These new powerfull servos are quite power hungry.
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Mark Dyson
Clown
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