When lowering sheeting angle, the jib sheet becomes closer to horizontal, pulling more force on the foot of the sail than at higher jib sheeting angles.
There are a number of ways to lower the sheeting angle.
1. Move your jib sheet fairleads aft (most common method and easy to do if you have movable fairleads).
2. Lower the jib on the forestay.
- Ease the upper luff tensioner (could be the halyard line) in the order of a few centimetres or so and take-up the lower luff tension control. (It depends on your setup though. Just make sure when using this technique you don't ease the rig tension accidentally. You only want to lower the jib on the forestay, not reduce the rig tension.)