Usually if your cut is running hard one way or the other its because the chain has been sharpened to much on one side. try to keep the strokes on the chain the same on both sides. but the bar rails do widen after time. the best way to keep this from happening is always making sure your chain is tight, a sloppy chain allows for more play as it goes through the cut. Oregon makes really good bars and chains, if thats what you have used in the past stick with it. Either that or go back to a husky bar. good luck!