I was searching for this exact topic.
I found that the upper left and right corners are fine on my machine. The lower corners are where I have problems. I think mine maybe part chain tension, but also interference between the sled and where the frame sticks out to support the plywood.
I also see a problem with cutting down vs up. Up cuts are smooth and identical on each path. Down cuts can have some slight wobble.
I wonder if I could get Fusion 360 to generate tool paths but only up cut vertical paths.
Ryan.