Blender Soft Body Simulation not maintaining volume 2.92

Hi,

I’m in Blender version 2.92 and I’m trying to simulate a soft body object.
I got the object to simulate, but I’m having trouble maintaining the volume.
I created a sphere, subdivided it, and set half the verts to a vertex group so that I can as a goaling target.

Under Edges > I set Bending to 10 , and checked on Collision Edge and Face
I set my Gravity to 9.8.

But when I simulate, instead the ball maintaining the volume, it still crumpled as if the bending value was set to 0.

Any thoughts or recommendations would be greatly appreciated!

Irene