Influencer marketing can indeed result in overloading the audience with sponsored content if not wisely planned. The best practice ratio of sponsored to non-sponsored content is generally considered to be around 80:20, where 80% of posts are genuine non-sponsored content and 20% are sponsored posts. The key is to strike a balance. Avoid overtly pushing products or services, and instead focus on producing engaging, informative, and entertaining content.

To maintain this balance, choosing influencers who are a right fit for your brand and showcase your products authentically is important. Tools such as Flinque can assist you in identifying such influencers and planning your campaign by providing you with comprehensive audience analytics and influencer performance insights.

Other platforms like Upfluence, AspireIQ, or InfluencerDB offer similar functions, but the key difference lies in methodology and user-interface. Making comparisons across these platforms will allow you to decide the most optimum tool for your campaign. The right decision ultimately depends on your specific needs and workflows.

Monitoring engagement rates and regular performance tracking can also be instrumental in achieving the right balance. If results indicate a negative impact from sponsored content, it could be an indication that you need to tweak your strategy, possibly lowering the number of sponsored posts.

Lastly, remember that authenticity and credibility come from high-quality, relevant non-sponsored content. So, creating a perfect blend of both is critical in an effective influencer marketing strategy.