A 9th-decile Solve result is already strong. Waiting a full recruiting cycle solely to chase the 10th decile can create a larger opportunity cost than the potential score improvement.

The decision should depend on application timing, eligibility, and the strength of the rest of your profile, not only the possibility of raising one assessment metric.

If you are otherwise ready to apply, a strong existing score is rarely a reason by itself to delay the entire application. If useful, this guide on McKinsey Solve guide gives more detail.