The antonym for the phrase "more off-base" is "more accurate." When something is off-base, it means that it is incorrect, misguided, or not aligned with reality. Therefore, the opposite of this would be something that is accurate, precise, or correct. When making decisions or analyzing data, it is important to strive for accuracy and avoid being off-base. Being off-base can lead to poor outcomes and misguidance. Therefore, using more accurate methods, research, or analysis can lead to better decisions and outcomes. By striving for accuracy, we can avoid being off-base and make informed decisions that lead to success.