Image sampler to effect gravity

I have use the kangaroo physics components to successfully form find a surface which appears to be inflated on a fairly complex object. My only regret is that the effect is less uniform that I would like where the thinner extremities are not as effected as the larger areas. I am wondering if there would be a way to enhance this using a gradient image. Or if there are any other suggestions as to how i might plump up the fingers of this form without plumping the center (3.2 MB)
inflation_03.3dm (2.1 MB)