[guineapig]

There are a minimum of three Quillmane spawn locations (some claim 4).
So unfortunately, although you may very well be killing the right mobs (the right mobs are all over the place as well), theer is no guarantee that the Quillmane you spawn will be anywhere near you.

It's not uncommon for Quillmane to spawn well out of the tracking range of the person who spawned it (unless you are a ranger with max track). And then of course there is the matter of multiple people gunning for it. So even if you do find it on track it might be dead by the time you get there.

If you dig around there is a map with some pretty accurate details on Quillmane on this server. It's an old post, but I found it again a few weeks ago so I know it's still there.

Yes, it is a bit different than on live. (The guides from live are helpful when it comes to telling you what mobs to kill but the maps... not so much. )