Gary, did you try to add batten pockets to a pre-existing sail? That's always been a very hard thing to do on a sail of any size, well done for achieving it. It's a major part of the reason why we now make our sails in the sequence: add panel/add batten pocket/add panel/add batten pocket and so on. Then only one panel, at most, has to be rolled and passed through the machine.
I've found that it's enough to screw on a small knob cut from plastic bar, to stop the batten parrels from sliding forwards. A saddle would have to pass through the batten pocket.