ATMA - Second set drop rate?

[Trell]

When I was doing Atma farming for my BLM a couple of months back, I was lucky if I got one Atma shard in 4 hours worth of FATES. It took several weeks to complete it. This week, I decided to go for my Bard Atma, and by day 3, I already had 6 Shards. I never had to grind more than an hour to get an Atma.

Is there a chance the drop rates become more forgiving after you've completed your first Atma? What's everyone else's experience with this?