Fully Battened all round faster, the jury is still out. I believe? that Tornado's are using both in light airs fully battened and leech battened, but now the rule is open they are longer! Fully battened in heavy airs, as you will find fully battened will hold there shape better. With fully battened jibs the sail maker will be able to achieve a finer entry, which is faster as long as you can sail at a high level as the concentration required is high level, otherwise you will be slow, you will be far better off using a much softer entry sail. Lowering the jib 1.5" would be impossible to notice any difference, if there is, even though we all do it at the front end of the fleet?? I would say that Tigermike was having a good day, and when lowering your jib there is more to consider, did you get the some rig tension, a small and I mean small change would alter the performance of the boat in any given condition. Now I can tell you that the lowering of the new tigers bridle tangs will make a difference that you will notice, not because of the lowering of the jib as such, but the whole package, with the given geometry of the fore stay, fastening height of the jib, jib sheeting angle and the given sail area that fits into this area. By lowering the jib means now the Tiger jibs will be cut with a longer luff, shorter foot and a leech more parallel to the mast, with a better slot. Shorter cord length = less drag, short foot= less turbulence with same sail area = same power all adding to more speed. Now you can ask a sail maker in their eyes newer is always better as that’s how they make their living, but my answer too, do you need a fully batten jib is are you running with the front runners and do you need a NEW “JIB” fully battened or not????