So is it just me, or do normal raids not simply do not go through killboxes, but try to (as far as I can tell) individually dig around your base as if they were small groups of sappers?
Noone ever go simple into traps.
You need to made your killboxes attractiv.
Like open doors that lead to your inner base, then raider like to path through it to attack your pawns or ignite furniture.
If raider don't find a way to you, they will just attack valueable structures they can reach, or break through walls.
This I think. I always feel a killbox is more attractive if it has a path through to my electricity generating stuff, could be wrong, a lot of this is subjective.