Isn't the calculation more involved than a percentage? For example, if I am not guiding, my mount will be tight against the worm gear on one side with just tracking. The worm is already engaged at one side of the backlash. If the guide pulse is additive in the direction of the tracking, you would want to add in all the backlash to the pulse. If the pulse is slowing tracking, it is already against the engaged worm gear and you would want to apply no backlash adjustment, just the straight up calculated pulse.

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