One of the key things I found was to try and start as close to focus as possible first. So do this manually if you have to with SGP. Then it's all about getting the step sizes right.
If you play around with the step sizes, and are reasonably close to focus to star with, you should get a 95%+ success rate which is what I am getting. Then leave the settings as they are and you are up and running.
John K.
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