Something I noticed and maybe its just pure luck, but I would do 5 fates on 1 job, then switch to another and do 5 again. Mostly got 3 out of of 5 fates every time. Only map that took forever for me personally was Sea of Clouds. While everybody else got their crystals within couple of fates, took me over 2 hrs before I even saw 1 crystal drop lol

After that I decided to just turn in my old zeta's (for alts) and skip that part all along... Yes I love cheating the system shhh :d