I'm with Jase - lovely image Steven. I'd even consider cropping the bright star out - it takes attention away from the Galaxies.
I've tried adding synthetic L too to try to make up for subs that were too short. I think it helped. Why did you do it in this case? When you say L=5hrs, does that mean 1hr of R+G+B + 4hrs of L? What length subs did you use? Also, did you do any sharpening on the galaxies?
Sorry for all the questions ...
... I'm in the middle of a new project myself and I like to know how the experts do it!
Cheers, Marcus