What governs the number of spirit meddlers typically found attached to lost soul spirits who are in limbo and what is a typical average?

As you have seen, the number of spirit meddlers that can be supported by a lost soul spirit is markedly less than a living person. This is not because the life energy is so very different, it is because the system for conveying that energy and interacting with the environment and the divine realm as well is constructed differently. So the lost soul spirit lacks the chakra system of the body which presents multiple gateways with the environment and thereby multiple points of potential access and reward for an occupying spirit. In the case of the lost soul spirit, it is more like an energy cloud with a dispersion that is not focused in one central location or multiple points as with the chakras. So there is no axis of alignment or hot spots, so to speak, and the fact that the being and its consciousness is so very isolated will mean that the energy requirement is greatly reduced because there is not a body to support, so there is much less energy coming in. There would be no point for the divine realm to feed a discarnate spirit the same level of energy as a living person who must maintain a physical body in operating condition. Even in a state of quiescence, all the cells need energy to keep going and to maintain their integrity and to still be in an orchestrated communication with surrounding tissues, with the nervous system, and other systems of the body. When all of that is gone and consciousness alone is hovering in limbo, the energy requirement is greatly reduced, and so these lost soul spirits are a much less appealing target from a total energy standpoint. They are nonetheless convenient because they are sitting ducks, so to speak, and cannot defend themselves against intruders who manipulate and torment. This is why such spirits, if they are lucky, are drawn to a living person and will attach out of desperation to something familiar, and this can be a life-saver, in a sense, by giving them a home. And then they can remain protected within the aura of their host and will have a better time being shielded from the savagery of spirit meddlers seeking to extract as much energy as possible by implementing as many ways of torturing the spirit as they can, knowing that the expanded energy they siphon away will be replaced and they can come back for more.