Simple Deform with Vertex Groups

Hi all,
I am trying to non-destructively convert a flat grid into a recurve bow shape. I thought I would create three Empties and three Vertex Groups (LHS, middle, RHS), then apply Simple Deform to each Vertex Group, using the appropriate Empty for each SImple Deform.
This worked but only half-way. There is a discontinuity between the Vertex Groups, as you can see. I’ve tried several things, can’t get rid of it. Any thoughts?
Thank you!
Bob