[Felix_Xenophobe]

You're totally missing my point here.

Now if someone could provide me with the Bigworm's AC/WC.

Let's say a bigworm has -6 wc and -10 ac.
Having -12 to -15 ac should reduce their hitting percentage by a little and with -5 to -10 wc you would have an equal chance to hit them.

By simply removing the bigworm's poison effect (I didn't know they had one. This because I've never been hit by one, balanced huh?) and actually giving it a GFX would solve the problem.