Have only sailed non-spin during frostbite when our rules won't allow crew out of the cockpit or up on the foredeck, so no pole. To sail dead downwind we use a preventer rigged from the boom to the jib car and back to the secondary winches on each side. This allows you to sail by the lee with the air flowing over the mainsail from leech to luff. Same way you sail downwind in a Laser. Helps to have a 'springy' luff, meaning not too much vang.
