Help with single point attractor

Hi everyone,

I'm having trouble with creating a point attractor definition. I'm trying to set the radius of each circle as the distance between a point in rhino and it's distance from the points of that circle. Even after dividing that distance by some value and plugging that into the radius for the circle component it's still goofy. I've attached the file and would appreciate any help... I'm sure there's something simple I'm overlooking!

Thanks