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I've often adjusted queue-limit as part of my QoS.  But then, I consider drop management an important, but often overlooked aspect of QoS.

Often increasing queue limits will decrease drops, but there are considerations beyond additional queuing latency (as mentioned in your referenced link).

In general, I recommend non-QoS experts avoid using WRED.  At first glance it seems simple, but getting WRED to be an effective QoS component can be difficult.