Btw SJ are you making a new thread for this?
and on another note: I'm not even sure haku needs 100% meter to do 100% dmg on some characters. Of course that's off a 6c full charge, fatal counter, but I just wanted to throw that out there.
Oh and don't quote me on that, I could be totally mistaken. 6c full charge and counter IS ridiculous damage though, even if it's not 100% you could probably get a good 70% for only a couple of stars, more if you're in the corner and/or willing to spend extra meter.