[Atraikius]

Try setting the 'must have amount' to about 20-30 for the drones and 150-300 on the fighters, and set the 'planet per item' values to 1 for fighters, 5 for drones, and 15 for ships. Then test them in a game increasing the 'must have amount' for the fighters and drones, and the 'planet per item' values for the drones and ships until they are building the quantities you are looking for without exceeding thier maintenance limits.