Optimizing Multi-CDN with Mlytics MPI – Anyone experiencing uneven distribution?

I am trying to deploy Mlytics MPI to optimize traffic distribution for the Undead Corridor international system. Everything is quite smooth, but I notice that sometimes the CDNs are not distributed as evenly as expected, especially when the load suddenly increases.

Has anyone experienced a similar phenomenon and has a way to fine-tune the routing strategy to be more stable? I want to learn more practical experience to optimize the current setup.