We propose a new hypothesis that could potentially have far-reaching consequences for the amount of Dark Energy and Dark Matter required in ΛCDM model. The new hypothesis proposes the development and existence of fine structural changes in the signature of the spacetime curvature contributions from subatomic particles arriving from far distant parts of the universe, which disrupt and reduce the effects of gravity over those distances. It’s proposed that when this structured spacetime passes through a baryonic body, it’s re-smoothed, scrambling any such signature in the spacetime curvature, releasing radiation and a backscattered gravitational potential. This shielding effect then casts a smoothed spacetime curvature shadow on a second baryonic body, which acts normally on the body. For a test particle near the edge of a galaxy, it’s shown how this could allow a particle to have a constant rotational velocity that is not dependent on the orbital radius. Hence the hypothesis seems to reproduce the linear Tully-Fisher relationship: log⁡(V)∝log⁡(M), and could form the physical underpinnings behind the highly successful Milgrom's empirical law. It also described how forces predicted by the hypothesis could extend to very large distances up to ~10-100Mpc, far beyond the inverse square law, possibly explaining several galactic and cosmic phenomena. We survey unexplained cosmological observations to see if the new hypothesis could help solve any such conflicts between observation and known theory. We report a seemingly remarkable ability for FiSS to fit unexplained phenomena, including, possibly explanations for spiral arms, barred galaxy structures, star formation in trailing gases for "Jellyfish Galaxies," ring galaxies like Hoag's object, the "vacuum catastrophe" problem, the Hubble constant and the "Crisis in Cosmology," the “Cuspy-Core” problem and many more which we detail here. We also describe how the new hypothesis predicts several falsifiable effects.