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Grahame
It is strange looking image - but I'm sure you will figure it out.
How did you check the focus? I'd like to see a shot taken with a Bahtinov mask over the scope, then one with it removed. To me it looks like the stars at the edge of the image are way out of focus. Although the ones at the center look in focus, perhaps they are not and the field curvature is making the ones at the edge look a lot worse.
The situation could also be made worse if your new focuser is not square for some reason. To me it looks at bit worse at the top than at the bottom of the image.
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