I've been milling for a few months now. I recently ran into this bowing effect on 2 large maple logs I milled up. Everything starts out straight as an arrow but as I get close to the heartwood I notice the kerf developing a bow the seems to get progressively worse if I don't take action. To stop the bowing I used a ladder with every cut, but I should not have to do that to maintain a straight cut. I am running a 660 with a 32"bar, Oregon rip chain, and a 30" grandberg. If there are some more experienced CS millers out there who have seen this before I'd love to hear your thoughts and recommendations. Thanks!