Never done this yet but seems like it may work. How you are locked out of drops every week is once you obtain one item the loot list never appears for you again until monday.
What if you never open any chests until reaching the end? Basically have players go back to other boss rooms and open the chests so theres 4 items in the loot pool. Have 1 person lot on all 4 items and have everyone pass. There you earned 4 items within one week.
Go back into Crystal towers again with your Free Company and repeat it it again 7 more times. Your Free Company 8 man static has earned 32 Crystal Tower drops instead 8 a week.
Like I said never tested it yet but any you mind testing this out.