Okay, so I've been wanting to talk about this for a while now. Basically, I feel like the drop rates have lowered but I have another idea. Does anyone know if they took the Storm elegant hat out or not? I can't seem to get it to drop from the defiler. I've been farming for 5 hours straight. What should I do?
When I'm farming single bosses, I make it a rule to fight them no more than five times a day. After five battles, I quit and go do something else. Next day, I'm back for five more rounds.
I did this for Lady Blackhope to get the unicorn statue; with the Defiler to get the storm hat; with Skullsplitter to get the Kraken (or maybe it was the Triton statue?); and so on. I got the hat pretty fast, but for the statues it took weeks to finally get what I wanted.
For longer dungeons, I limit it to no more than three runs per week.
By limiting my efforts to small batches, I avoid burnout, anger, and frustration. If it doesn't drop for me, I know the plan is to come back again when I'm rested and try again. Eventually I've gotten everything I've ever set my sights on ... but it did take patience and persistence.
So my advice is, take a rest. Do something else for a while and then go back for a few more runs. Rest again. Repeat. Eventually you'll get it.