Eh...I never had a level 3 goblin archer doing even close to 30 damage. Are you playing on a modded Tactician+ mode? Having said that, I find the arrows superfluous. Micromanaging my archers to use single arrows will be about the last thing I ever do in this game. The old games had them by the stack, and there were different ammo slots, so it worked for them. Here, not so much. But their mere existence so far hasn't bothered me. They're a source of a little extra money.
As someone else who does not always appreciate Larian Goofiness™ (very fitting, LOL), what exactly did you tone down?