Instability onset times as a function of ejection granularity. Each point is one realization’s instability onset (circles: ejections throughout the giant-branch phases; squares: AGB-only; leftward triangles: systems already unstable during the mass-loss epoch), from the 48-seed grid of 3 Gyr integrations; fractions at right give unstable/integrated counts. As M_ej grows, the distribution both fills in (higher total instability) and slants toward earlier onsets, terminating at fiducial M_ej in a substantial population that never survives the mass loss at all. The gray curve traces the earliest onset at each M_ej.