I gave this option a try, aside from changing it to a small AOE, the damage seemed unusually high, small spitters could do about 4-5x the normal damage? 10-15 hits to kill a player with heavy armor, normally it takes about 50.

also the bugs maybe arent using the correct sound? sounds like a flamer thrower.

The sound is a bug.

Part of the reason it took 50 hits before is due to the fact the projectiles couldn't miss, so damage had to be low.

Do you have a better number range and some reasoning for your pick?

Since static defenses do most of the fighting, I wouldnt have expected a big damage increase, if that was intentional - maybe add a comment to the tooltip?

from wiki, without mods
player 250 hp, heavy armor 3/30% acid
spitter small/big 10/30 damage, against heavy armor - 4.9 damage - 52 hits / 18.9 damage - 14 hits

So basically the small spitters are doing as much damage as big spitters would?

I didnt test it enough to say for sure, but it looks like the walls were taking damage in increments of 30 and I suspect the AOE was allowing them to tear down multiple layers of wall at a time.

It was an intentional bump in damage, I can add a tooltip comment.

I can do some balancing on the damages as well, I believe that my original numbers were setup pre-0.15, so the health regeneration changes make a big difference.