I don’t have any experience of this scope either but I would certainly agree with Jeremy that small refractors are best for imaging at these scales. For visual deep sky though, you’re right that aperture is key, the more the better! You may notice that the really dedicated visual DS people now need to transport their scopes on trailers!
FYI, I’ll be showing a couple of your images during the Sky Notes session at next weekend’s BAA meeting. If you are going to be there please say hello.