So as a response to my own thread, I have some thoughts.

First, a progression check at each gate. If the boss HP% is not below a threshold, than the fight resets.
Next, reduce the number of adds. Make the remain adds stronger. This reduces clutter and makes the battle more visually easy to understand.
I've never manned the Dragonkiller, but it seems weirdly far from the rest of the fight. Consider putting it in line with the cannons/snares.

These are just some small thoughts that I think could help this trial from being the abandon ship immediately duty.