In hardwood square holds up fine, dirt it hates. When production cutting I don’t file anything everything is ground in the evening my thinking is I’m paid by the thousand board foot Scribner scale so we swap chains every so often. When sharpening square the biggest thing is the outside corner is lined up that’s your strength of the tooth, with the inner corner controlling how aggressive/blunt the cutter is.
I dont suppose you have a video or pictures on showing this square grind method? My guess is you first need a high quality chainsaw sharpener. On second thought I'll let you do the chainsaw work and I'll run the forwarder, I like buttons switches and nobs..............


