Doing some more testing with this set-up, I find that the second safespot (between the second and third bomb icons) is more consistently safe if you nudge yourself -just- left of center. Somehow there still can be a stray bullet that annoyingly finds its way down there. The final arm on the right can sometimes, for reasons that are unknown to me, reach to that just-left-of-center area, so nudge back to the center if it spawns (you can leave the smaller arm alive and just ignore attacking it, too). It's also important to note how I kill that left arm at around 00:44, firing before I move to the left. I have found that by not firing until I get into second position, the timing of shots is off and can die from the arms. There's a lot of little adjustments you might need to make but this is still the best way to go about the fight!
Doing some more testing with this set-up, I find that the second safespot (between the second and third bomb icons) is more consistently safe if you nudge yourself -just- left of center. Somehow there still can be a stray bullet that annoyingly finds its way down there. The final arm on the right can sometimes, for reasons that are unknown to me, reach to that just-left-of-center area, so nudge back to the center if it spawns (you can leave the smaller arm alive and just ignore attacking it, too).
It's also important to note how I kill that left arm at around 00:44, firing before I move to the left. I have found that by not firing until I get into second position, the timing of shots is off and can die from the arms.
There's a lot of little adjustments you might need to make but this is still the best way to go about the fight!