I appreciate the time you put into this. I apologize in advance if my reply doesn't appear to do justice to the body of work in the OP. I have always held the view that it isn't shameful for Roger to lose to the best clay court player of all time. I don't believe a change in technique or racquet size would have helped him much in those FO finals. Nadal was a beast in his physical prime and certainly much much more attuned to the surface. Interesting take nevertheless.
Luke had a better H2H but Vader is still the GOAT.