Collision deformer question

Hi all,

I've been playing around with using the Collision deformer instead of a Metaball, but was wondering how to adjust the place where the material "pinches" between two objects.

Here is an image to explain what I mean:



I was hoping to create something "gooey" that would pinch and stretch for a while before breaking.

If there is another way to this other than the Surface deformer, I'd love to hear it!

Thanks!