In a network security environment, a security analyst is tasked with creating a custom signature to detect a specific type of malicious traffic that has been observed in the organization. The traffic is characterized by a unique payload structure that includes a specific sequence of bytes followed by a known command. The analyst decides to use the Sourcefire IPS to implement this custom signature. Which of the following considerations is most critical when defining the custom signature to ensure it effectively detects the malicious traffic without generating excessive false positives?