Thank you very much for the message!

This is really helpful. We are aware that many KST and RJX servos are rebranded BK. They are having same issues.
More recent KST servos are likely designed just by KST, but from our experience some are behaving little bit odd, too.
Or there is a kind of regulation inside which is probably causing wrong corrections.

So that imperfect behavior was observed also when used for Cyclic/Rudder. It require quite different settings than any other servos.

Any other brand, including the cheapest chinese servos were never causing such issues during our testing. But again it could be only related to a certain models, revisions, versions of these servos.

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Spirit System developer