Four batten sails are too baggy for me I had some 4 batten Sailworks Revo's once - 5m was awful but 4.4m was fine so changed 5m to new 5 batten model the following year and normal service was resumed. So as a general rule of thumb I prefer to have 1 batten for every metre of sail (at least up to 8 or 9m or it would get silly)
You're never too old to do something foolish! k881mark