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Hi Steve
If you are using a short strike, that’s possibly your problem. Short strokes polish the outer zones more than the centre. Try to stick to 1/3 stroke. If you are worried about a turned edge, try more of a centre over centre stroke or a Narrow 1/3 W stroke.
Check contact carefully. A good way is to warm press some some nylon fly screen into the lap and make sure you get an even imprint of small squares all over the lap.
Is your lap microfacetted?
The other possibility is an incomplete grind. Perhaps from too short a stroke combined with insufficient time at one or more of the early grades.
Hope that gives you a few ideas.
Rod.
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