After the nerf is sort of confirmed, I decided to solo it before it comes.
I am pretty bad at shooting as not much practice. This resulted a rough run but glad it worked out.
0 Eternal still as I boomed them all XD
Some tips for BM solo:
1. You never want to stay on the same platform as Kalos starting P2
2. Making sure that Kalos is always within sight, so you can avoid dive and breath
3. I usually ignore UFO and the game is called to shut down left
4. Use BA to time the FMA and use will to counter the blind/bind
Starting 2-3, if you failed 2 shots in a row, likely it will be a failed run. But this will be much easier after they changed the charge speed :)