Z setting question

I tried looking up this in the forum but didnt find what I was looking for
I recently did the z carriage upgrade found the info to set the screw revolutions(thanks Phil) but what I couldnt find is the speed of travel going down up seems fine but down is super slow carving doesnt seem to be an issue but its slow when its probing

Here is a starting point, then adjust to what works best on your machine.

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