Why don't you guys swap a proper LSD unit while you're in there. the stock unit is ridiculous ...
Wheel speed difference driven pump is as far away from racing as you can think... diffsonline for example sells E39 M5 40% lock LSD for a reasonable offer ...
http://diffsonline.com/rebuilt-210mm...clutch-40.html
1200$
This is something that will change the car's character