Had seriously considered the C11 Rob but with more focal length again than the 9.25 tracking would have to be absolutely spot on and we don't want to upgrade the EQ6, so the C9.25 EQ6 combo should work really well
You won't regret getting an EQ6 they're a great mount
By the way your image with the focal reducer we assume is the full frame and not cropped at all ??
D&B