Latex tube - deform feature?

Hello all,

I am creating a piece of latex tube to be stretched and released in a slingshot type assembly. I have been able to use the deform feature (curve to curve) to deform the latex in the shape I want, however, with this feature I can't figure out if there is a way to release the latex to a state of equilibrium, i.e not in tension.

I may be using the wrong feature completely, any ideas are appreciated!

I have attached the file for experimentation.

SolidworksParts And Features