Warrior Final Attack after Big Bang

Does FA triggered by Slash Blast still use the following formula after BB? I am trying to see if the damage reduces for each mob in an attack like it currently does.

Slash Blast FA:
D = 2 * (1/3) ^ (OrderHit - 1)
Cumulative damage = 3 * (1 - (1/3) ^ NumHits)

It definitely reduces, but I couldn't find any maps with enough high-hp mobs to really test it properly, until I was already at a level where I didn't use SB anymore. On the first 2 targets it's about right though.