I have never seen anyone dip pole jibe a J-30. I think having the weight of a crew person all the way on the bow would be slow. In heavy air, it would make the boat harder to steer and more likely to wipe out (though we have used sheets and guys in heavy air). In light air, the weight of sheets and guys hurt spinnaker shape. Also, if you end up short handed, its next to impossible for one person to dip pole jibe on the foredeck. Finally, the J-30 pole is oversized, so it would have to go up pretty high on the mast to swing easily through the foretriangle. I think most boats below 34 feet end for end jibe, and most larger boats dip.
