If you want the radii of the circles to update as they move around the image, you’ll need a different goal.
Luckily there is now a component to do exactly this, including the option to prescribe a tangent boundary:
https://github.com/Dan-Piker/Kangaroo-examples/blob/master/collisions_and_packing/Image_circlepacking.gh
You can see also some further discussion about variations on this for if you want a compact circle packing where each gap is surrounded by 3 circles:
https://discourse.mcneel.com/t/circle-packing-in-enclosed-boundary-unwanted-overlap/80292/6?u=danielpiker
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