Just trying out the demo version to see if my scope will autoguide, but I can't get it to work after hours of trying :-(
As you can see from the screenshot below it rapidly jumps and then just gets worse in both directions. Increasing the X-aggressiveness doesn't make huge differences e.g. from 0.1 to 1.0 or higher. Increasing the Y-aggressiveness makes it go through the roof - the plot goes almost vertical at 1.0. I can't see what else to tweak to flatten the curves out at a near zero constant
http://images.yellowbell.net/public/guiderrs.JPG