Was having an issue where drones would not path find at all, watched one for an hour straight and he did not move.
found out other mods(construction drones) were hogging all the path finding resources on failed path finds (they were stuck in the walls they built) after debugging (F4 and F5 for others having a similar issue)
I haven't modded much but if its an option maybe try change the algorithm to use the train pathfinder or something that doesn't use the same as your other mods.
