Hi i play a while on your mod, but increasing recipe cost make non sense when one thing occurs. After observations, robots in groups if non leader get stuck, even in large groups just disappear (members of group left behind). This thing make me sad, soo i start big research in Factorio folder, after i find this:
game.map_settings.unit_group.max_group_slowdown_factor = 1

game.map_settings.unit_group.max_member_speedup_when_behind = 2
game.map_settings.unit_group.max_member_slowdown_when_ahead = 0.8

--> game.map_settings.unit_group.member_disown_distance = 25

game.map_settings.unit_group.min_group_radius = 8.0
game.map_settings.path_finder.use_path_cache = true
game.map_settings.path_finder.max_steps_worked_per_tick = 300
game.map_settings.path_finder.short_cache_size = 50
game.map_settings.path_finder.long_cache_size = 50

If we use console in game with:
/c game.map_settings.unit_group.member_disown_distance = 200 (seems to make my robots not disappear)

I dont have big skills to script soo maybe you can use this to make only for player force.

Edit1: Sometimes robots seems to idling in small groups (also they are not selectable with command tool) but after while they "fixed" themself and started moving towards enemy. I same situation before fix they just disapear.

Edit2: This robots seems to make after while new squad. I really want in config option to limit max robots without circuits.