i dont think it picks loot based on weight sets. I also see this happening when my toon is questing and picking the wrong items. I have also made my own weight sets.
Try changing the -1 to 0 in the weight sets and see if that works. It works with DungeonBuddy since I changed it. Although I'm not sure it will work in your situation.
Try changing the -1 to 0 in the weight sets and see if that works. It works with DungeonBuddy since I changed it. Although I'm not sure it will work in your situation.