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Good advice from Lee.
here is an old image taken through a GSO 8 inch f4 without CC. In this seeing, coma is readily visible at less than 10 arcminutes from the centre.
Also agree that getting a coma corrected fast Newtonian to work properly can be a headache, particularly on a bendy OTA like the GSO. Maybe a CC corrected f5 Newtonian could be a slightly better bet - could be a good match to the pixel size of your 294 and with a good CC it could be effectively free of major aberrations.
Cheers Ray
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