I don't have discord (I can, I know... I should!)
For example if I edit the collision box to
collision_box = {{-0.4droidscale, -0.4droidscale}, {0.4droidscale, 0.4droidscale}},
for all 5 droids. Then put back entity.lua at the right place in the archive, then restart the game. Then use my saved game and 'instanciate' on map my remaining crappy rifle bots, they still keep the 0.8 colli box. Is it because it is stored in game, even if they were in my inventory and not on map? That is utterly weird!
BTW I think your colli box should be smaller, by achieving greater density, the bots can be made more efficients.