For that type of trip, I would think you must have a second, smaller
jib, around a 100% for sailing in breezes say 18-30. You should also have storm sails, unless you plan to never be more than a few hours from a port with guaranteed entrance (sounds not likely). Storms sails IMHO would involve a storm
jib with a removeable inner forestay and a storm trysail or a three reef main.
Good luck.