Looks good mate... The stars at the outer edge of frame are a little stretched, this indicates field curvature, and a field flattener/focal reducer is the way to go to fix this... The William Optics FF/FR v2 or v3 is what you want.. They both work well with the ED80...
Are you stacking with Deep Sky Stacker? If so, then throw the couple of 10 min subs in the mix, it will stack them all together and you'll get a bit more of the nebulous extension...
Heres a link you should have a read of, I think you'll find it useful
http://www.astropix.com/HTML/J_DIGIT/LAYMASK.HTM
If you have **ANY light pollution, 15min at ISO800 is going to wash out pretty harshly, if you want to run longer subs for better Signal to Noise Ratios (SNR) then you should go to 20min ISO400 (equal to 10min ISO800) it will have equal data to a 10min ISO800 shot, but much less noise..
Simple flats. Put a white T shirt or a white plastic bag over the end of the scope, and take 10 to 20 short exposures, enough to show the vignetting on the image.
Best of luck with all that, And for your 2nd image
Great guiding, awesome focus.. well processed... Cant ask for more than that!