Had mine rebuilt t'other month at 50,000 miles. Both sets of UJs were stiff/notchy and have been from 40,000(ish) miles.
I also replaced the FD with a very low mileage 2nd hand unit and will get the original one rebuilt at my leisure to have as a spare.
I've always had loads of backlash in the drive train and the new UJs and FD have made no difference what so ever. The clutch has always been, and still is, my friend when pootling in stop/go traffic.
Interestingly every Guzzi I have ever owned (old Tonti ones and modern 1100) have far less back lash and, for that matter, as good if not better gear boxes/drives. The 1100 especially has such a sweet gear box, almost up to wet clutch Jap standards.
Andres