Loot table for blackwing lair

Hey! Our raid on sundays having problem with a really stiff loot table om our BWL sunday raids. For 14 weeks in a row we have more or less have exactly the same drops. Caster gear with pretty high droprate have nerver been dropped and we overall lack dps caster drops in our sunday raids. It feels like our loot table is looping itself every week. Some items allways drop and some with 20% drop rate never been seen. Its frustrating and tbh kinda wierd its so bad loot algoritm in game. Its not supposed to have the same loot dropped that many weeks i a row, caster dps start to go with other raids cuz no caster loot never never drops.