[Klorissana]

fe-taru, Do you practice in some university kendo club, where the practice is usually lead by seniors?

I have similar situation, not as serious as yours though, in my university kendo club.
He was a big guy, in so much fond of taiatari, in addition to wild datotsu. For advanced kendoka, he was not a problem at all, they could easily deal with him. But for begginers, he was the one to avoid.
I don't really have any suggestions, sorry.