Nice image, great detail.
I also get the same coma results with my 9.25", Meade reducer and 450d on the outer stars. I have been told using a Celestron reducer will fix this but I am not totaly sure.
I assume you took the image with the 350D? if so is there any chance you can post a phoyo of you image train. The only reason I ask is I to have a 9.25" and a Meade reducer and had to buy the snub nose T-Adapter from Bintel to get the camera as close to the reducer as possible to reach focus, the standard Celestron 936330-A left me to far away. I was looking at the off axis guider and my calculations showed me with this unit in my train I would again not read focus.
Carl