That 10 day bad patch, clearly shown on the graph, is a certain width. Compare it with other peaks & troughs & there is something there.
You're imagining things. It can look like there is a system or pattern when you look at a small set of data. In reality it's random.
However, if it's only 10 days long ( for example ) then any pool-jumping will be pointless.
No, it doesn't matter how long. If you could pool-hop based on predicting luck then you'd make a lot more coins. But you can't.
There's already many users struggling to understand random/luck. Some believe bad luck doesn't occur naturally and ask if the pool is broken every time we have bad luck.
Don't make it worse by suggesting luck is predictable and follows a certain pattern. It doesn't.