I have been cutting and sharpening on my own with my saw for years, but have never run into this problem to this degree. My saw wants to hook to the left really bad when I start cutting anything much bigger around than my wrist. In the past when it would want to cut a little off course, I would give it a good sharpening and that would fix it. The problem has gotten to the point that it ain't any fun to saw wood anymore. Ha! I assume that I have gotten the cutting teeth too far worn down on one side of the chain that routine sharpening won't even up. There is plenty of tooth left to grind on. So can any of you experts out there tell me which cutter teeth to really grind away on to straighten out my cuts. Thanks for your advice in advance.