DS - Tracking Bridle
This photo shows the mature DS design with Tracking Bridle.
Spars are P300 SkyShark.
Regarding the elastic cord design, I am currently using a 13 inch piece of 3/16in elastic shock cord to apply the compression resistance force. This length and stiffness seem to work consistently well for wind conditions between 5MPH and 30+MPH.
A flight test video showing the Tracking Bridle in action can be found at: