When I picked my boat up Matt said the only time to let it all the way out was in really high wind. In which case I think you could argue to just not put the jib on anyway. I see your concern though- I used to sial a 6.0 express that bsically had a jib the size of our spins. Any amount of sheeting on that POS would backwind the main so I have been wary of that every since.