Jib car position affects the weather helm load you get in breeze. You can lower the weather
helm a fair bit by going back further on the jib cars and allowing the top of the jib to open up a bit and spill some of the heeling force. You're also flattening the sail and making the shape less powerful, and less inclinded to round you up. related to sweating in the jib hard, but with slightly different behavior.
- David