Like Adam9242 says, if there is an issue it gotta be because NPC's hit a tad better on EMU servers.
It was first much later in game that they added a diminishing dps on charmed pets, because somewhere between Luclin and PoP, NPC's began to be designed around that you would always have a slower in group to slow them between 50 and 80% so they were redicolous OP'ed dps when charmed and hasted.
Just be glad that it works so well here
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