The angle of fire of the mortar (left and right) should be narrower, if placed at the walls and having a little distance between the outer wall and the inner (which you should have if you don't want to get your turrets killed by AOE dmg from modded biters) it's inevitable that a mortar a couple meters to the left and right hit the wall. I made a picture for illustration: https://snipboard.io/hMXIdO.jpg

Good day! This is not so much a problem with the turret range as it is with the defense configuration...

Unfortunately, I cannot fulfill your request because both I and the creator of the original mod have different gameplay preferences, and I do not have the appropriate knowledge to add your wishes as mod settings...

Therefore, if you want to customize the mod for yourself, then in the mod archive at ironclad-gunboat-and-mortar-turret-fork\prototypes there is a file entity.lua

This file contains the parameter turn_range = 0.375

You can adjust it to the desired range.

Ah okey thanks :)