FWIW, thanks to @flovo script, I’ve been able to see that OGS algorithm seems to be really self adaptive against abnormal data.
We’ve done a check based just on timeout wins (where, for instance, I undeservedly won against some dan player), but it heartened me about the overall system.
As long as the outcome series doesn’t contain frequent and recurrent anomalies, rating should be able to correct itself fairly quickly.