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If 1 player killed Mob X they get 1000exp
If 2 players kill Mob X they get 1100exp each (so working in pairs = more exp)
If 3 players kill Mob X they get 600exp each (now your starting to get punished)
If 12 players kill Mob X, they get 2 exp each (this is so much less then 1000/12)
That, plus the mobs in trials and dungeons give crap exp even if you DID solo them. They did say they are going to review this, but 1.7 is going to be months away. Dungeons and trials are not worth it for CP farming.