@Anteus I was finally able to dedicate some time in testing this yesterday and I concur with Toke. There is a stark difference in latency with WED on and WED off.
With WED off, there is an unquestionable (and reasonably predictable) impact in latency vs. bandwidth that occurs with modifications to aql_txq_limit. However, with WED enabled, I am unable to see any real impact upon latency/bandwidth regardless of the aql_txq_limit values.