i was messing around with Bo Rai Cho and i found out two new infinites i didn't know about. maybe somebody here already posted them, but they were new for me. i've only done them in Practice mode though so i don't know if they are unblockable or not. the first one is (XBox controls):

Back + B, Y, Y, X, X, X (repeat)

and the second one:

Back + B, X, X, X (repeat)