Nice big post NewB! Some interesting facts in there... but shame, I already know most of those. Probably because I've been around for a long time! :P
One of the most annoying things ever is that most common Judo move that people do. The contract pecs, chest and abs then the hips etc. I've found a few counters to this move... but they're complex and normally you never get enough time to actually finnish it. I know you're going to say: "Use mah seekrit script" but I say stfu :P
I disagree about the dancing thing though. Dancing is an art in itself... a good fighter ought to be able to dance and NOT cause self-damage. I can do it fine. Thing is, if I do the hit and run, then dance... even if I have lower points, the other guy always normally tries to do something and does self-damage and gives me the round. :P
Letting go in mid-air when you've been gripped can be disasterous... like, how do you know the other player hasn't done a nice spin move? My secret for this is usually to relax all and then ungrip. More often than not, I'm in the posistion to use momentum and kick the hell out of them (or punch).
Even sometimes after the opener move, I just go relax all for the heck of it, see what posistion I end up in and fight from there. Many times, it does win.
I agree with the "protect" vital bits part. BUT It's annoying, I want to use other moves that require my vital parts exposed.