The jib and the main twist do match..but they both need to be in considerably further / sheeted harder. I use the spreaders as a sheeting reference for the jib...and I would sheet the jib somewhere just outside of the tip of the spreaders in that kind of breeze. It should come in a little further as the wind gets lighter and be just inside the spreaders in the light stuff. So I guess, start with the sheeting arrangement to find a way to get it to that point. Then move the sheeting blocks fore and aft to get the jib to twist off at a similar rate as the main as you ease both off when cracking off the wind a little.

Some vectran would work well as a cable replacement with minimal stretch and still be a good bit softer on the knees.