Just did a test flight with my other servo (emax) with the ball furthest out on the small round wheel (about 10mm). Tail slider does still have a little slop, even after the CA fix.
Result: had to lower the gain a lot and still: wag wag wag
tail is not holding direction anymore in flips and pitch pumps.
So... i need to put the ball further inward to pull down the mechanical gain down and get more resolution on the servo.
I have a video (night flight) but resolution is poor and no use to upload it.
More testing tomorrow.