"More retroactive" describes something that is even more retrospective or looking back on past events. Some synonyms for this phrase could include "further backdated," "more historical," "increasingly retrospective," or "even more backward-looking." Other options could be "additional retrospective," "extended retroactive," or "more deeply introspective." Each of these phrases emphasizes the idea of reflecting on the past, perhaps to gain new insights or to correct previous mistakes. When used in a business or legal context, the term "more retroactive" may also imply a greater degree of scrutiny or thoroughness applied to reviewing past actions or decisions.