OK, I was a part of the Hunters at Legacy lvling in Thor, once.
We don't care about dying and excessive winging (both fly and butterfly) in fact.
How do we do it? If you're low level, DS a few times then fwing if you're alone. If not, fwing till you reach a large group, then gang on a Kasa together. Since there's so many people ganging on one Kasa, it is sure to get hitlocked. If you're high level, DS till it is in range to bestow fatal damage on you. Then fwing.
Let me tell you this, it is OK to DS ANY KASA. I repeat, any Kasa, for any number of times, before you flywing. Why? Because in a large server like Legacy, since there are so many people DS+winging around, even if everyone only DS'es a Kasa a few times before winging, it is still bound to die soon due to the extremely large amount of lvlers.
Dying every 3-5 minutes is fine. If you're at a high level and care about the exp loss, just bwing, rebuff, warp back ASAP.
What you really need is, LOTS of flywings and bwings, and a buffer at your saved point + a good weapon. That's all, really. It IS very efficient. Much faster leveling than if you were trying too hard to keep yourself alive. Remember, DSx???, fwing, DSx???, fwing, rinse and repeat till your SP runs out. Then bwing, rebuff, click on the healer, warp back ASAP, and repeat the cycle again.