To use this tool you have to set up the chart right. There should be major points that are touched on the arc. Just size the circle so 1,2,3,5 or 2,4,6,10 as I use, hit the points. The easy way to calibrate the hits is set an approximate number like 10, then click on the next ratio in "format" where you are adjusting the ratios. Make sure the format screen is out of the way so you can see the results. If it hasn't hit yet adjust the ratio to say 10.2 etc, then click on another box in the "format" ratios. The new circle will draw. This is how I set them up. Make sure all,or almost all, of your circle radius's hit real data points on the fib radius's (or arcs). Check the circle aspect with the "projection tool", just above the zoom sign at the bottom. The circle should match the projection tools arc pretty well. It's better if the ellipse is out on the bottom, more than the sides. Okay.