Yep, those rolls line up with a 1.3x Attack boost! Presumably actually 5325/4096, like GF likes to do since Gen 5. And yes, I checked, those rolls specifically would only occur with an Attack boost, not a base power or damage boost (i.e. Life Orb).
Has anyone tested if Ripen doubles the effect of the type-resisting Berries (e.g. Occa, Passho)? Bulbapedia says it does, but neither of the damage calculators I tried (Showdown's and Trainer Tower's) changed when I put Ripen as the Ability.