If System 1 is that worn and there's nothing left on the tensioner, chances are the seals in the links are shot and possibly the pins are coming adrift in the outer links, have a good look. Could be SALT time. In my experience, Two things S1 doesn't like are side slopes and abrasive sand. Whether the seals can't stand lateral flex as well as SALT I don't know. Be interesting to know what others on here think.