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Pretty much the way I worked it. I must do it again and really dial in mine one day.
The advantage I had was using Voyager to capture focus test images. I set up a script to do a focus run ((On a single centered star) then step outward by a given about (Say 100 steps of the focus motor) then take an image, then step in by 10 steps, take another image, and repeat that until I was 100 steps inside the "Best" focus. You can then use ASTAP to analyse the images and spit data out in to excel which can plot a graph to show where each corner and the center of the chip were at best focus. If I wanted to get really tricky I could calculate how many microns per step to work out distances as well.
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