Note in this picture I am using the jib sheet to tension the rig.. That works also... I guess...
Not sure using the jib sheet to tension the rig is such a good idea. You end up putting the bridles and forestay at funky angles and you also put a lot of load on the jib blocks/tracks. I imagine that if you were to really crank in the mainsheet tension, you could break something (either a jib block or a bow tang would be my guess).
I think it would be a lot safer to use the jib halyard to tension the rig, or just pin the forestay lower in the adjuster to tension the rig as is done on all the other Hobie models.