If your upper and lower tails (inside or outside - doesn't matter) are breaking at different times, then it's not necessarily the amount of out your sheeting is providing. This is more a function of how far forward or aft your sheeting point is. Envision that if you moved your sheeting point aft, it pulls more on the bottom of the jib leaving it flatter. It also would pull less on the top of the jib leaving it fuller. The opposite is true if you move your leads forward - the top gets flatter and the bottom fuller.

If your top inside tails are breaking before the leeward, you need to flatten the top and belly up the bottom a bit by moving the jib sheeting point forward.


Other things can affect this to such as the amount of tension applied to the jib. If you are not sheeting much and are leaving twist in the jib, you can also affect when the tails break.

With regard to inhaul, you are are trying to match the curve of the mainsail so the jib slot is the even from top to bottom. In/outhaul and tension will affect this. You need enough tension to be able to point well and the in/outhaul position to shape to the main properly.

There are basically two things to try and achieve here; getting the jib slot to be even from top to bottom with the main sail and to get the tails to break evenly. Three things will affect this; sheeting tension, jib in/outhaul, and fore and aft position.