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Another Update
After two imaging runs I think I can confirm that most of the tilt and flex remaining was coming from the Moonlite focuser. I put a stack of 10 subs together of the better seeing I got on both nights.
The first image is the top left hand corner, second is top right hand corner, then bottom left, the bottom right and finally centre of field.
There is still some errant tilt/movement in the right hand corner, but nothing extreme. So using the Atlas has worked.
I have been reliably informed the best place to chase the last lot of movement is in the bracing on the secondary cage assembly and to provide a counter balance for the secondary on the spider. The bracing is an easy one to address but the counter balance will be more difficult.
I think generally, though the scope looks ok for general imaging for now with some minor sorting to be undertaken, including a small moment of inertia around the secondary cage.
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