Coarse and fine focus step size

[Corpze]

Hi, I am trying to find the best settings for the autofocus routine in Sequence.

My scope is a f3,4 which have a critical focus zone (CFZ) of 27 microns.
My sesto senso / Starlight feather touch combo has a resulotion of 0,0007423mm per step  (should be 0,7 microns right?)

in the Autofocus "tab" in sequence, when i measure the V-slope, i get a value of 0,83mm in the coarse focus box and half that value in the fine focus box.
Isn't theese values far to high to be able to pin-point the focus?

What is your typical value for a telescope this fast?
 

Edited October 14, 2019 by Corpze