As for using fib circles. The particular tool is very difficult to fine tune because it's not set up for doing ellipses, really. A proper ellipse tool has 8 draw points...4 sides and 4 corners. I show a fine tuned pic of TXN in "ideas". I think it's under the title crosshair for ellipses or just ellipses...don't remember.
The way I fine tune the settings for the circles is i leave the "format" screen open, but once I set a sizing to test...I click on the ratio in format, next to that sizing and the circle (or ellipse) draws.