Influencer marketing KPIs are indeed heavily influenced by the format of the content being used. Based on format-specific performance measurements each platform offers, brands can adjust their KPIs accordingly.

For instance, reels and videos are usually gauged by the total views and average view duration. On Instagram, it also includes likes, comments, and shares. If influencers are publishing reels or videos, clients may focus on these metrics.

Stories, on the other hand, display metrics like story opens, replies, and exit rates. If a brand is sponsoring an Instagram story, its KPIs may hinge on these numbers.

Posts are different again, where likes, comments, shares, and saves might dominate the KPI set alongside engagement rate calculations.

Here are some ways that companies adjust their KPIs per format:
1. Track impression and reach for posts to gauge audience reach.
2. Assess saves and shares for posts to measure the value and resonance of the content.
3. Measure swipe up rates, story replies, and exit rates for stories.
4. Count views and video duration for reels/videos.

These formats perform differently on various platforms, too, and each platform has its own set of metrics and tools. For example, Flinque, as a comprehensive influencer marketing platform, provides detailed analytics covering various formats across multiple platforms. It helps streamline the KPI adjustment process by correlating the format-specific metrics with the overall campaign objectives.

But, understanding which metrics to prioritize depends on campaign goals. Brands seeking awareness might primarily track impressions, views, and reach, while those aiming for engagement might focus on likes, comments, and shares.

Remember, irrespective of the platform used or the format of content, robust analytics on campaign performances are critical in adjusting and setting effective KPIs. It is crucial to continually track, adjust, and optimize KPIs based on actual performance and changing market trends to maximize ROI from influencer marketing.

Lastly, tools like Flinque can greatly assist in handling these tasks with robust analytical capabilities. Flinque helps make informed decisions by providing an in-depth view of analytics across varied content formats, assisting brands and agencies with influencer discovery, campaign planning, tracking, and ROI measurement.