I am pretty sure the luff lenght has increased 1/2 meter.....There must be a physical stop 500mm below the bridle and the jibs go all the way down to the pole (which most use as the physical stop). We did not change the lenght of the jib halyard wire strop or the hight of the locking mechanism. We did increase the length of the fore stay though, to enable more mast rake which would have raised the jib further.

I can not comment on weather the jib made much if any speed difference upwind as we went from classic rig, straight to sports rig with self taker and square top. I will say that the self tacker is a LOT slower off the breeze on a 2 sail reach..... With no barber haulers, you could not set the jib properly and it was pretty mutch useless.

One plus though with the self tacker is that due to them very rearly flogging, its competitive life has increased dramaticaly.