Sixty-eight days gives you a reason to ask questions, not evidence that 13% will be accepted. The seller may value speed and certainty, or may simply be prepared to wait for a price closer to the listing.
Ask the agent which matters more to the seller: timing or the headline amount. If flexible...
Also price the failure scenario, not just normal service. What money is due if the transaction stops, the coordinator becomes unavailable, or you terminate after the offer? The agreement should explain handover and provide access to the correspondence, document list, fee approvals and current...