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I do not like rk chains. I had a 530 xso rk chain on my fzr and it would slack out of speck every time I road the bike. Granted my rear shock was blown but the chain on there before had been fine. I've been using ek on my 95 ninja and had zero issues. But yeah over tightening a chain will ruin it really quickly. You can also wear out your counter shaft seal and end up leaking oil. Also make sure you are adjusting and checking it at the tightest spot of the chain. Tightening if at a loose point will cause it to be too tight at the tight points.