YOU HEARD IT RIGHT FOLKS!!! I HAVE SOLVED THE ATMA ISSUE!!!!

all you need to do is:

1. Gather a group of 3 Lalas and yourself.
2. Take them into the lost city of amdapor.
3. Get all the way up to Diablos.
4. Lock them little screamers into the boss room.
5. Wait for Diablos to slaughter and dismember their small bodies.
6. Gather up the pieces of their bodies that is left over.
7. Attach those pieces to your armor and weapon.
8. Complete the first FATE you see and you will get the ATMA in that fate FIRST TRY!!!

IT IS PROVEN! DIABLOS IS THE RNG GOD! SACRIFICE ALL LALAS TO HIM!

tl;dr: Sacrifice Lalas to the RNG God Diablos. It really works, or your money back!