Take this statement with a grain of salt as you wish, but experience from the ITN has told me there is some truth in it!
Whenever a pool posts much higher rewards than the one you're delegated to, this is usually due to luck, with exceptionally high block assignment for a single or a short series of epochs.
But since statistical averages cannot be messed with, great epochs will at some point always be followed by not-so-great, or even outright horrible epochs. Let me tell you our staking4ADA pools have had their fair share on the ITN as well!
So, you wait for another pool to peak, re-delegate to that pool and you can bet your sweet little *ss that pool is going to perform miserably the moment you're in it 😲...
...while the pool you were unhappy with, was just about to start its winning streak for the year 😤.
With 5-day epochs, patience will be key my friends!