I sympathize totally and if mine goes out again I'll be very pissed, but your story doesn't give me much hope that the fix will hold for the life of the bike. I rode my old Evo for >100k miles and didn't have any drivetrain problems at all.
It also seems obvious that fluid choice is not a factor. You used the prescribed Formula+, another guy reporting here used Syn3, and I used Redline Shockproof Heavy. Redline approves this fluid for Harley trannies and even re-labels it as a V-Twin product, so I won't believe it caused my problem, which was the disintegration of the plastic wall of the bearing. My tech is not happy with these things, calling them "plastic bearings," and claims the part is the same for newer bikes too. Maybe they made a batch of bad ones that we were lucky enough to get, then fixed the problem. It would be unconscionable and irresponsible for them to use a bearing design that long knowing it was faulty.
Mine now has about 5k since the work was done and I hear no odd noises yet. I'm also keeping my belt looser than spec (1/2" cold at 10#) to keep strain off that bearing.