just wanted to post this from my exp. I have found that if you dont watch where you have been but watch where your going you can cut a better line. when your watching behind the blade to check what you have already cut it looks like the cut isn't straight but most of the time it is. Now I only pay attention to whats in front of the blade. This seems to help me. The biggest thing I have found with circles is don't be afraid to turn your work and try not to stop while cutting.
Most probably know this but hopefully it will help someone new.
