Raist, you're caught in a devil's proof. You can't establish that this issue is not SE's fault.

1. You have to prove that the reason this issue is occurring is because of infrastructure and not SE server configuration.
2. The only way to prove that is to get a massive amount of data/logs from each user who is having this problem (as 1 ping/trace does nothing)
3. You have no means of obtaining this massive amount of information. The reports you're doing here is like a grain of sand in the desert.

Thus you cannot prove that this is not SE's fault.

Likewise,we are caught in Hempel's Raven

1. If lag affects our game it's SE's fault
2. If we don't have lag, it's not SE's fault.
3. To qualify 1, in the past , when there was a lag, SE has been able to resolve it.
4. We have no lag SE is doing a good job.

By the same reasoning, the statement would be: If we have Lag, SE is not doing a good job. This is paradoxical - I can think of 100s of occasions where I can have lag and it's not SE's fault.

So what is the solution? The problem is that WE'RE LACKING IN INFORMATION. If SE would be so kind to provide us with more INFORMATION we can start finding a solution. It could very well be our fault. However, we don't know without INFORMATION. And there's literally nothing we can do.