How to handle uneven ULD weight before the air cargo cut-off

Once, at the airport cargo terminal, I was rushing to meet the cut-off for a late-night freighter. The problem didn't seem big at first: just before the cut-off, we realized the center of gravity and weight distribution of a ULD were not ideal, but I was afraid that unloading and repacking it would cause us to miss the flight. The suggestions from the people on-site all sounded reasonable, but…