I've got a fairly new, quite stiff mainsail. I used to have a dutchman system, but my sailmaker pleaded with me not to put the dutchman system back in. To aid in flaking the sail I ended up making little squares and little triangles of sail number material, and stuck them on the luff and leach respectively. At the luff, the little blue squares are all on the port side, and on the leach, the little triangles are all on the top of the boom when flaked properly. New an experienced crew can flake it in seconds with just some simple instructions ....
Chris