The flow of gravity particles is not unlike the magnetism model, but with several significant differences. In magnetism, particle flow is related to the shape of atoms, such as iron, which allow a flow to begin in the first place, and is related to the types of bonds these atoms commonly lock themselves in. Magnetic particles surge out of a break in the rhythm of subatomic particles such as electrons circling the nucleus, a surge which does not occur in other atoms that have a more even balance in their halo of orbiting electrons. Magnetism thus produces a field, with a flow, and this flow is discernible to the degree that one could almost imagine a river, watching magnetized particles on the river position themselves according to the flow.
Gravity particles produce a flow but produce no discernible flow, and have no irregularities in the pattern. Does your Earth not pull evenly from all parts of its surface? And if there is a flow, then at what point does the flow reverse, such that surface particles are pushed away? In fact there is a reversal, but the outward streams are propelled, with a force and at a speed so much greater than the downward drafts that this occurs over less of a surface area and without engaging the mass of the object. A laser of gravity particles, versus a floodlight upon the return. So why would the weight of returning particles be the only ones mankind is aware of, and why would they not feel the violent lift of the updrafts? The updrafts blast through, tearing a hole as it were, where the returning particles do not tear what they press upon, and so have the greater effect.
Gravity particles, in their motion, do not affect what they move against or through, the effect being in essence mechanical. The upward drafts push aside other matter, letting it return upon completion of the updraft, leaving no trace of the temporary tear. The downward push of gravity particles returning to the large mass they are attracted to, the core of the Earth for instance, spread out upon objects they encounter, taking some time to drift through these object and with a constant downward press during the motion of this drift. Thus, returning particles, due to the time they spend upon and within the surface objects, and due to their continual direction of motion, are a mechanical force that is stronger, overall, than the updraft of particles that quickly pass through the surface objects, essentially pushing them aside rather than engaging them.
The nature of this gravity flow is what determines the repulsion force we speak of. It is a complement of gravity only when large bodies are close to each other. The updrafts, when encountering a large body also exuding updrafts of gravity particles, hold the bodies apart. This occurs at what humans would call a distance from each other, as small objects such as satellites do not exude updrafts and if far enough from the surface of a gravitational giant such as a planet, find a down-draft and updraft of gravity particles in balance, what humans might term in their ignorance a zero gravity field, weightlessness. At this point the updrafts are still tearing through, but at a slower rate, so that a mechanical push upward is involved, and the down-drafts are more thinly dispersed over the surface as they work their way through the density of these objects in space. Large bodies, exuding their own updrafts of gravity particles, create a situation where their updrafts and the updrafts from another sun or planet bump against each other, creating a buffer and preventing the gravity masses from touching or even approaching each other except at great distances.
Within black holes, the down-draft still exceeds the updraft, and thus the same rules apply.