Another tip I can give for any dungeon is that leeching is fine for your first few tries in a dungeon, but what is indispensably more valuable is learning how to push in and making it your normal thing to do in any dungeon will be so much more safe when performing these dungeons in smaller groups :)
lost my 8/8 like an NPC in the Nest when the spinning move starts since the dagger shaped bullets really blended into BG somehow for me, perhaps a tip is to really practice your eyes with that bit since it is considerably the worst phase of the boss
one general tip that you didn't mention but i think is worth mentioning is to just record your perspective/gameplay when trying a dungeon so you can go back and look at what mistakes you might have made (positioning, getting a better understanding of shot patterns, etc.) there's a lot of instakills in this game and if you don't know what just killed you it's really important to be able to look back and see what happened