Dennis,
I have tried similar comparisons myself now and then. Always found it very hard to accurately compare, because processing and viewing makes such a difference. My attempts have been with galaxies and less obvious than yours here with this PN.
There's no doubt your 10min subs one is better. Over sharpened? Unsure, perhaps slightly, but it's not "awfully over sharpened". You've got the object very well defined in that image.
Interesting comparison
