My Hobie 20 has this same 4-way system with the wire accross the tramp. According to the manual, that is the way the class rigging is supposed to be.

30 years ago my Tornado had the rachet blocks on the hull track and an in-haul to twin blocks slung under the boom. You could adjust the slot using the in-haul and foot tension was dictated by the position of the rachet block on the hull track.

We also had a standard barber-haul to the end of the front beam.

Why isn't this set-up used now? It would eliminate the cross-tramp wire.

It also made it so the jib was automatically sheeted in or out slightly, depenant on the mainsheet position.