I have amended my post above to show the proper sequence and all 10 weapon delivery and yield options.
When WE177B first entered service only LL was authorised for selection and we understood the radar was not operable at that time. Later we were given one target where the DGZ was in the bottom of a ravine and the attack track on the normal to the ravine. It would have been impossible for the aircraft to descend to 500 feet and deliver the weapon and getting out again would have been impossible too. We told the crew to use RP. Now whether that would have worked we have no idea.