Great insights, Bill. I have recently been working on this myself. My hands are at their peak with traditional grip, and I feel that in the best of all worlds, matched grip is quite possibly an overall better solution. But making the change takes so much work, mostly because it's about changing the hand position of the weaker hand so that it works just like the stronger hand does.
One good thing about matched is that you have a model for greatness already.....assuming that your right hand is truly strong, "all" you have to do is get the left hand to work exactly like the right. No small feat actually, but I agree that working on french grip is an important thing to do. My right hand has wonderful finger control and I am certain that is because I spent years working on the the jazz ride cymbal pattern using french grip.
I also agree that working harder is not the answer --- in fact, it can hurt you by reinforcing incorrect movements.....an important idea to understand.