The hunt in Stag Bastion is strong but for my personal experience is only good for teamhunt during rapid respawn where you can use the tower below Adlerauge using the east exit and the north exit, and maybe use the upper level to the left if the team is too strong in order to not to break the respawn. This is also a good spot if you are waiting on the Night Harpies to respawn but you should be prepared as they hit hard...
For a normal respawn rate I know duos team hunt (EK and a mage) using the bastion/castle were they can get around 10kk raw and maybe a little more exp during Night Harpies raid.
For Bloodfire Gorge (a.k.a as Underground) after the density nerf the place became a Solo hunt for players 1000+, or maybe duo hunt for lvl 800 as the respawn can easily break now. This place is safer than the bastion or surface due the fact the Night Harpies raid does not occur in this spot.