How to improve the distributions of the automatic internal links?

You can improve the distribution of the automatic internal links with the Random Prioritization option available in the Advanced section of the plugin options.

With this option enabled, the order used to apply the AIL with the same priority is randomized on a per-post basis. With this option disabled, the order used to apply the AIL with the same priority is the order used to add them in the back-end. We recommend enabling this option for a better distribution of the AIL.

More information on the prioritization of the keywords is available on this FAQ.