The "only" config you can change for this pool is intensity and even then its not possible (e.g. 280x).

People pointing at your config, where totally underestimating how overloaded the (only) server was.

Some people had already good configs and after trying elsewhere got good performance and only when they were here they had high rejects. Higher than the expected 10%~ due to the coins that are mined...

Whats a bad config? What setting on the miner did you change? You know that queue, scan time and expiry have no affect and its all driven by the server.

In my subtle way and thanks to Kalroth, it was proved that really the only setting available to you is intensity.