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Nice image Dennis. Yes I can see some of the problems you state. Experimentation and thinking outside the square seem to be the way to go.
Flexure seems to be the PC phrase of late but I think you may need to look a little further and look at primary items such as focuser sag etc. to come to a resolution. The aberation at the top could well be repaired with Darks and flats and maybe even checking sag and camera alignment. Some of the field curvature may be fixed by adjusting the distance between the FR/Flattener and camera.
Nice single image but to achieve less noise and better clarity (S/N ratio) you need more exposures. Nothing you do will make such a massive improvement.
Nice image and good luck.
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