Have looked at:- D.O. ...

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Have looked at:-

D.O. control. Don't over or under aerate. We get complete nitrification with average DO of 0.5 mgl. You don't need 1.5 mg/l.

Have you checked the F:M ratio? Try and maintain at least 0.1. Do you measure MLSS daily?

Is the incoming sewage quality consistent? You can't control, but it could be a factor.

Have you tried increasing the static fill time? Say 30 minutes? This has worked for us.

 

Let us know how you get on.