probably going off on a slight tangent but in the very early days of digi servos i had a ko digi and struggled with glitching and general problems fitted old analogue ko (with fet lead, pre brushless and lipo days) problem disappered again . I can only deduce that the speedo couldnt deliver enough power through the BEC to supply the more hungry digi servo .I still only have one digital servo now and 8 ko anologues of varying age and i find i hard to tell much difference between any of them
maybe i'm just s**t
regards dave