Ok I think I get it, that corner is molded for the Non R/T models and the reason why it doesn't fit properly is because it's a bit to sharpe of a turn and not wide enough to make the turn to fit around the R/T's fender flare. I'm sure this will become very clear once I get them. Heating up that area and using a Socket to open that area up to make it fit is genius. You might not think you did a good just but from the pic's they look like got them to fit very well.
When I go my install, I will also take some pic's and layout what I did so other members ca benefit from this. I wrote to Dodge describing how dissatisfied we as Durango R/T owners are for them not to make a front fitting mud flap. Why on earth would any company not make them for their SUV's don't make any sense at all.
Nissan puts them on just about all their pathfinders right from the factory as it just makes sense to have them. All 3 of my Pathfinders came with Mud guards/flaps if you will. I was very surprised that the Durango didn't offer them in the options. Having people go and buy aftermarket flaps is a huge mistake as that money is lost. It only makes sense for them to make them.
Thanks again for taking the time to explain what you did here. It's really helps a lot. Good luck with your R/T she is awesome looking.