OK...same exact bike as mine. You have incredible taste!
Here's what I do with mine. I pulled them apart and removed the neoprene protector that goes under the straps. That makes the straps thinner. I remove the pillion seat and place the widest strap just in front of the seat locking mechanism and the rear strap falls just forward off the bracket that captures the rear seat tang. I have the straps velcro'd at there narrowest possible width so the bags ride properly vertical if not a little high but they sag with weight to be nice and straight. You'll notice that the wide strap will intrude on to your seat but it's far enough back that you won't even sit on it unless you had bars that give you a very upright position.
This runs them fat side forward which sorta looks backward but it fits the geometery of the bike and especially the angle of the exhaust. I attach one of the web loops to the passenger foot peg stay and adjust it to buckle the forward end of the bag securely.
The only issue I had which may not be an issue for you was that I had a Fendar Eliminator and those neoprene drapes attached to the bag would fold over the LED turn signals. I cut a portion of the drape to stop that. I just remove the top Tri-bag when my wife would ride. Locking the bags down with the seat eliminates the possibility of them getting stolen, too.