So I picked up this set of Jandd Mountain Panniers that I THINK I'm happy with. They took me about half an hour to install so that I'm comfortable they will stay on the rack. However, I typically REMOVE my panniers when I leave the bike for an extended period, and these don't seem to want to come off.

Is there a trick to loosening the bottom hooks so that they give up the death grip and let me have my bags?