depends on point of sail
If you are on a broad reach or running, jib only works well, but if you are beating or reaching, the imbalance with the centerboard keel will make it hard to control, severe weatherhelm. As far as overloading while reaching, the boat has a backstay which takes twice the load with the mainsail up, so can't see why a jib-only would create any extra forces. The boat behaves better under main only. Both sails are about 100 ft2 so the sail area doesn't change but the balance does. In my experience the boat does not go well to wind without both sails in play.