I got an Oregon saw sharpening kit awhile ago (I wanted the depth gauge and roll mostly), I haven't used all the files yet, but the 4mm 5/32" file seemed of very poor quality. Is this a fluke? I'm filing Stihl chain, which I hear is harder, so that may be part of it. I was going to order a box of the Oregon files thinking maybe I just got a bad one, or should I just get Stihl files (or some other brand files). I realize files are consumables, but I want something decent. Thanks