1) Get some buddies together and make a premade
2) Run 2-3 runs of each floor
3) Profit

If everyone's after the same drop you may need more than 2-3 runs but still it won't be 30. Even if you don't have a full 8 man premade, you'd be amazed at how much easier it is to get your drops when 4/8 people already have what they want for the week.