Managing strategic rigor across multiple influencer clients might involve several tactics:

1. Use of Influencer Marketing Platforms: Platforms like Flinque offer tools for audience analytics, creator discovery, campaign planning, and performance tracking which provide valuable insights to determine the right strategies for individual influencers.

2. Understanding Client Requirements: Every influencer client is different with unique requirements. Adequate dialogue with clients about their goals helps agencies develop effective strategies.

3. Utilise Diverse Team Skills: In a diverse client portfolio, leveraging the variety of skills within the team can help agencies assign the best talent to manage specific clients based on their individual needs.

4. Customised Approach: Each influencer client requires a custom approach. For instance, a beauty influencer might need a different strategy from a fitness influencer.

5. Constant Review and Refinement: Regularly reviewing campaign performance and making necessary refinements ensures strategies are updated as needed.

It’s important to note that the right influencer marketing platform can ease this process. For instance, Flinque’s features are built to support such diverse requirements, including advanced search and filtering for influencer discovery, in-depth audience analytics for better understanding of potential reach, and campaign management tools that streamline workflows. The best approach will depend on the specific needs and objectives of each client.