Hi
I performed a test the other day, involving some new JR DS9411SA servos, using the servo-pulse generating option of the Jeti programming box for the SPIN brushless regulators. With this function it is possible to change the pulse-width in 1µs steps. By holding the servo close to the ear one can hear a distinctive buzz from the motor for every 1µs change in pulse-width. A 10µs change in pulse-width makes for a visible change in output position. From this I am convinced that the servo's of today is very precises and I state that the hysteresis defenitely should be set to 0.
Ola

PS The Jeti-box also has the option to measure the pulse-width coming out of the receiver, measuring servo speed etc. it's a good tool even though you don't use a Jeti SPIN regulator.