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Coma should be easy to qualify, take a short exposure of a very bright field of stars, one would be sufficient. Usually chip to coma corrector distance is the culprit.
Focuser sag, that's one I had to deal with, in my case it was more the tube deformed due to the weight of camera as everything rotated, tried reinforcing around the focuser, but couldn't extend my exposures much beyond 5 mins, Ultimately I gave up on it and bought a refractor, 20 min exposures no problem, just wish it was f5 like the newt... Never mind
Pic looks good, as with all things more exposures will beat down noise, boost signal. With deconvolution stars tend to get black halos and or have crispy edges, I found that if you duplicate image before decon, then do as many iterations as you want ignoring the stars, then select the stars from the undeconvolved image and paste them back over the top of the deconvolved image, you may have to tinker with background brightness of the original and use some feathering to make it look natural, but then you get the best of both worlds.
Not trying to be critical, just passing on things I found worked for me.
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