They need way way more HP and/or defense, it's sad that some FATEs die much slower than elites, not very elite at all. I mean technically FATEs and hunts are similar, the difference being FATEs are designed as casual friendly content and elites can spawn anywhere on the area and not just in the same blue circle. Even if arguably hunts are as casual as FATEs, which they kinda are, elites should be harder and last at least as long if not longer than FATEs.