I start using an averaging gauge at .025. I file without the gauge in place. I put the gauge on, see what the discrepancy is, remove the gauge, then count file strokes til it's right. I check the next ~3 rakers before completing the file stroke count. If everything's holding, I file the rakers...
Full skip would be my guess. I've never run it on a big saw, but the 42cc poulans inexplicably come with skip chain by default. It's a chattery, grabby experience, and it would only be worse with more power, and working the nose of the bar.
I saw an animation of a saw chain working once, but I can't find where I saw it, and I can't think of a search term to bring it up. It's a little more complicated than you may imagine. It's a series of rocking motions on the raker that allows the tooth to bite at a certain depth. I think that...
I've never had a chain stretch out of adjustment range, but I understand it's common on the big west coast bars. Could the chain have started too long? There's some flexibility with drivelink count, but if a chain that's too long which squeaks by when new, could go out of range as it ages...
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