The “objective system” is a lot more general and abstract, and evolved to correct for deficiencies in the subjective system, but doesn't influence behavior as strongly.

However, if you translate the objective system's findings back into imagined subjective experiences, you can intentionally "correct for deficiencies in the subjective system". See e.g. Eliezer imagining the number of worlds with serial killers lurking behind the shower, or, well quite a lot of psychotherapies and self-help techniques.

Even the Litany of Gendlin (when done right) is kind of a back-door way of doing this - contemplating the hypothetical "If I live in a world where..." clauses is a sneaky way of getting your brain to project the subjective experience of being in such a world, which then usually triggers the subjective system to say, "Ooops... you're right, I'd better update, because if that is the case, I really had better know about that."