I can really sympathize with you in your situation. Although my experience isn't nearly as bad, it has it's similarities. Alright, at our dojo there is(or was, not sure where he has been)this one fellow who had been bogu at the time I started kendo(June last year). Anyway, after I got into bogu, I guess you could say I began to catch up on him, skill-wise. Whatever the case was, he must have felt threatened and in ji-geiko, he would start to go really all-out rough and sloppy(similar to what your two kendokas are doing). But please note, this guy is by all means a respectful and good-kendo person. He just wanted to show me who's who. Anyway, I got tired of him acting like this, so I layed some smack down. In the end though, we were pretty evenly matched. My point: show these guys who's boss, smack them around a bit. And, put simply, when push comes to shove and the match gets more rough, taia-atari the guy on his ass and sneak a solid men in, you know the kind that really smarts. Show them what you think of their behavor. Also, I'd talk to your sensei or sempai if it continues. Just my advice. -Holmgren-san