[Arkham]

I think we are trying to avoid defense reduction mechanics being over used on the MK fighters, and just save them for the most appropriate.

I feel like acid mechanically should have similar effects to fire, so I don't see an issue with it in its current state.

Also, the 3-Hit Attack is most interesting due to the gamble nature it currently has, forcing you to choose when to use the Acid Spit. Adding to the feel of a combo. With your proposed version, that gamble no longer exists.