FATE grinding doesn't teach players anything, no group play, no skill rotations, no gear difference and no party play.
Eliminate any party bonus for FATEs, don't give EXP for fate mobs, half company seal reward and make FATE mobs strengh increase with the number of participants.
The FATE blobs will quickly get smaller when mobs start to onehit 5k HP tanks.
Fact is, FATEs require a nerf.