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Ray,
Stars look great , perfectly round with longish subs
Well done !!
Your image train and resultant FOV is bit more forgiving than on my 8” f5 newt
Your FOV with the 183MC is 45 x 30 arc mins
Mine with my 2600MC is 81 x 54 arc mins so I’ve have a bit more field to correct especially in the corners ( and even wider on my 6” f6 newt )
It took me many nights to get the spacing just right as you know. Factors like tracking , guiding , seeing , objects altitude , wind , humidity, dew , Collimation, tilt etc.... all can affect your Star shape which doesn’t help trying to set your coma corrector.
Martin
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