Peter
There’s nothing wrong with imaging under a full moon, I do it all the time with humble Canon 600D and no filters. You just have select your targets according to conditions.
I image Globular clusters and bright Nebula during half to full moon. I don’t bother with galaxies as they’re dim objects which require dark skies and plenty of data depending on your scope
That’s still a very good result with a short focal length scope ( 600mm FL ?? )
One of my favourites NGC 253 ( I received Bintel image of the month last October for my NGC253 )
Good on you for going after these dim objects
Well done !!
I use my 8” f5 newt to hunt galaxies does a good job , although I’d like a 10” f5 ( focal length 1250mm ) but my EQ6-R Mount wouldn’t handle the payload
Maybe an upgrade in a year or two
Do you have a bigger aperture longer focal length scope ??