Cavedude had mentioned one temporary solution was to give the swimmers the levitation spell - This keeps them steady at what ever grid they are on. Problem is these mobs in Cauldron go in and out of water, so they float on land, and it doesn't look right.
What I'm thinking is. what code is related to levitate? maybe make an "in water" exception and apply what ever it is that removes the "gravity" in Levitate, while swimming. There must be some code that tells the NPC he is in water and this puts him in "swim-mode" (they start swimming while in water). Maybe you can exploit this and use it to eliminate the hopping too (while in swim mode, don't use Z coord).
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