Change knob modifier fine tune sensitivity

[whoopsydoodle]

I'm finding that when I use the keyboard modifier for fine tune (control, alt, or command in this case) the sensitivity shoots so high that the knob basically stops frozen unless you whip the mouse so far that then it will jump to an uncontrolled value.

Basically the fine tune modifier is useless currently.

How do I change the sensitivity that's used when the modifier is active?