I made a set of sliders for my C-boards and glued them to the top of the trunks. It allows me to go from neutral to +5 degrees of cant. One line pulls them both back at the same time and the bungee pulls them forward when I release the cleat.

Works really well running downwind to keep the bows up, and neutral cant upwind reduces the drag.

My next step is to build longer C-boards, and increase the size of the rudder winglets to stabilize the increased lift generated by the C-boards.