I suggest hard mounting the bags you have. Clearcoat is not a hard material and once you throw those bags over the rear fender and ride a few hundred miles, I am betting the fender paint will always be scuffed. Also, throw over bags tend to droop more. With the hard mount set-up, the bags should stay in the proper position better and not tend to look so sloppy. (No offense intended to anyone who has throw-over bags. I just like a more rigid look personally.)
I have the Willie & Max Revolution bags with their universal mounting brackets. They work great. I even added some threaded rod and fasteners that allow me to undo 4 acorn nuts and the bag comes off with ease for cleaning the rear wheel. Also, when I layed it over last Nov. the bag was strong enough to keep the back-end up off the ground. Between the bags and the highway bars, I had very little damage. The bag is scuffed some, but actually still quite usable. Good luck with your project.
'07 VN900 Classic
Horsepower is an illusion.
Torque is the source of all good things.