In 2011 I called Exedy and asked them how much t/o bearing travel is needed to disengage a clutch.
Their response was It should start to disengage at approximately 6 mm of t/o bearing travel, at 8mm most clutches will be completely disengaged, these are generic numbers the lever ratio of the pressure plate spring will have an effect on these numbers.
My old t/o bearing fork has a ratio of ~1.9 to1, so 8x1.9=15.2mm needed at the slave cylinder. I measured my slave cylinder travel tonight at 13mm.
I have the non-adjustable slave cylinder set up, the t/o bearing is always touching the fingers of the pressure plate so all 13mm are used to depress the pressure plate. I am shifting around 6400 and the clutch is disengaging. I have a 240mm Jim Wolf technology clutch and a Fidanza flywheel. Hope this helps.