To cope with a solution for a ...

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To cope with a solution for a low DO Bulking

Without a complete overview about your wwtp, but only on the base of tipology of  your cronic bulking and wastewater process, I would like to say that could be an high level of soluble COD and high F/M. So, you have face (one or more) to this possible actions:
1) Increase MLSS with a lower flow of waste sludge, paying attention to SS out of secondary clarifier.
2) Make possibile a differentiation of level oxygen distribution by creating an aerobic selector (more DO) able to face the first high level of organic load.
3) Make possible obtain a lower organic load with a different pretreatment of wastewater 
4) Make possible obtain an higher DO level by facing an upgrading of aeration system.

A more depht analysis on load data and on Microfauna and Filamentous Bacteria may be more suitable to understand how your bioreactor work..