To say "I thought monos will sometimes yaw", doesn't sound like first-hand experience. Yet I suspect most of those that did yaw, folks made that observation with a dead animal on the ground. That's like saying I have heard and seen pictures of small calibers destroying sides of meat, and that doesn't get received because I've actually never observed it in a dead animal that I've shot. I would caution to take that with a big grain of salt.
I am not shooting small calibers (270 win smallest, 280 Rem, 30 cals and 35 Whelen) but I've never had one yaw. They punch a hole going in, tatter and chunk up the vitals and punch a hole going out. I can tell this by observing the dead animals on the ground.