Evidence for a Late-Time Kinetic Transition Improving CMB, BAO, and Supernovae Simultaneously.

We report extended MCMC constraints on the Stratoverso cosmological model, a scalar-field extension of ΛCDM featuring a late-time kinetic transition. With respect to v2, three major improvements are presented: (1) a C¹-smooth implementation of the conformal reset that eliminates the spurious late-time ISW instability affecting earlier versions; (2) a substantially longer MCMC exploration (runs v4+v5, >21, 000 accepted samples) identifying a deeper posterior minimum; (3) a partial resolution of the Hubble tension. The model preserves early-time physics exactly as in ΛCDM — including the CMB acoustic scale and the age of the universe (13. 754 Gyr) — while modifying the cosmic expansion only at z 2σ, indicating a statistical preference for conformal resets over standard ΛCDM. Per-parameter convergence: R̂−1 < 0. 1 for all physically relevant parameters (H₀: 0. 069, λᵣeset: 0. 071, gₕolo: 0. 077). Full convergence (R̂−1 < 0. 01) with multiple parallel chains is in progress and will be reported in a forthcoming PRD submission.