That is a great update and cool pic showing the wear on the clutches, which is very minimal to not even take off all the blued surface. As for handling and stuff, I can see where you are coming from. There are other factors like tires (size and compound), suspension setup (camber, bars & springs, etc) and what you are using the car for will have a big impact on how tight the diff should/can be.
I ran 40 lbs in my LSD in my 510 and worked great on the street, but when I had slicks on at the hillclimb, I'd get severe inside tire spin on the corners. So, big grip and hard corners will (or could) make it feel like an open diff, but that's the only time I had an issue. Thanks for the write up!