Not a bad effort ... good amount of exposure time! and better result than I expected from a DSLR.
Good plan to think about what objects match your gear, rather than fighting against your gear working with it
I'm not sure what you did with the central star though! vapourise it?
I'd expect it to easily stand out but somehow you've wiped it out
Perhaps focus, but the object is so diffuse anyhow it's hard to say what your focus is like, other than the missing central star.
How do you focus your DSLR on your scope at that FL? Must be tricky for fainter objects like this.