You should consider that absolute control over objectivity anywhere and everywhere is an impractical desire. Nature will just not support it. There are too many features of consciousness which are elusive for a limited entity. It is not possible to have the upper-hand and there is no proof that you had the upper-hand in the past, nor in the present and so we can assume that you will not have it in the future.

What to aim for under these dire circumstances?

Sensible instinct so that even if there is no objectivity, still the behavior and responses will be in the best interest.