Your board is not the cause. Cord/mono could be. Mono stretches. If it still happens with the tow line then after you've let your release out, say to port, then just very slightly turn to port and the drag from the lure will pull it right out. My tow lines are usually tied off at about 42" above water line & have never had problems getting them out to the board. (50-60 ft out) One other tip, when letting them slide out, keep your rod tip high.
Tom B.
(LongLine)