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That's a very nice image Peter, nice detail and natural, vibrant colour!
I think the elongated stars are likely due to a combination of image tilt and the Paracorr spacing. I believe that the recommended 55 +/-4mm is too lax and can result in a curved focal plane. I am currently using a Paracorr with an STL-11000 (with the spacing set at 55mm) and the effect is quite pronounced due to the large chip. I have some additional spacers on order and will be doing some tests to find the optimal spacing for my 200mm f/6 Newtonian when I am back (I'm currently in India with work).
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