Hi, I'm a newbie to this forum, bought a 18ft Mystere, had it out at least 10 times, flipped once, with 2 (200lb) guys had exterme difficulty righting, anyone can help, can't find any info?? We have a divise at the top of the mast to stop the turtle. unclip the sails, and use our weight but still no luck, now we practice in 4 ft of water??any ideas would help please, thanks Paul