Acid bolts' procrate is determine by the level difference between you and the target, as well as mob resistances.
On a non-resistant mob, you should see close to a ~70% procrate if it's just barely in IT range.
Maybe you're fighting mobs that are too high of a level? It drops off pretty quickly in usefulness if the mobs are well above IT.
edit: if you are concerned about whether it's worth using at all: if you don't have a dispel in the party, you could use it on mobs that use defense boosting abilities (like cocoon), because removing that debuff is really useful. The actual effect of the bolts isn't major.
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