Update ... day four 39 fates and I had my drop all 4 days combined just under 170 fates for it.

My chocobo got 200k exp (Rank7 now, yay!), ~11k GC seals

I needed 200+ fates in the area with Gluttenous Gertrude, I did her 20 times on one day. How I know that? I check how much more I need for the next achievement, I was around 800. I got my achievement before I got the atma drop.

And yes, I did have my zenith equipped and had on most fates gold, on some silver, no failed fates.

I wouldn't be surprised, if our names somehow have a checksum which is entered in a formula for the drop rate. This is the only reason I can find behind some getting 12 Atma within one day and some getting 0-3 in the same time