Sorry to hear that you had to spent so much time on the issue. Most people don't even think that while one does all the research and testing the fun of dirt bike riding is totally gone. I know what I am talking about, not since my clutch problems but I also spent way over 40 riding hours of testing with a Mikuni equipped orange bike.
Its always frustrating until the crucial point is reached. For me the worst is, if a problem exists and I cannot find out what the heck the root cause is. Then all the testing is trial and error and that can sometimes take forever.
Looking on my personal problem with the clutch, it would have been better and only a little more expensive to order a core manul from Rekluse the very first day the problem appeared.
Its good that I can't afford a new Beta at the moment...