So I decided to play around and try to substitute Spinning Fire Blossom in for Blackout Kick and I got some pretty cool results.
Hitting Sha himself SFB was doing almost 10k dmg per hit. Which I thought was pretty substantial. Now I know this doesn't include the tick, and was my rotation far from perfect going into this dry. But it was a fun little change tonight and looking forward to trying this on H Elegon this week to see what damage it brings me.