Just looked and that was one of my square ground work chains in that first video.Just wondering, are you using a full chisel or semi chisel chain in the demo? I ask because a company sent me some of both to try. I've only ever run full chisel. I put on a semi chisel and I gotta say, not a fan of it. Works ok when the full bar is making contact but for using the nose I find it a bit choppy.
Square is very smooth if ground/filed right, then you just adjust the rakers to the saw/wood.