I got the sword a few days ago... I have no idea what the last percentage was cause I was blind drunk, but I certainly hit 6 xtals at the end. Nice theory
Didn't work. I think it's safe to say this is nothing more than a coincidence. I'm actually glad there isn't a easy way to acquire the sword.
From what I've seen and heard. It sounds like there's a sweet spot between 19-10% so using xstals from 19% should do it unless some lucky SOB sneaks a few shots in-between