Could you please enable CONFIG_MAC80211_DEBUGFS in Flint 2 (GL-MT6000) firmware?
This would expose /sys/kernel/debug/ieee80211/phy*/aql_txq_limit for Aggregate Queue Limit (AQL) tuning — already supported by the mt76 driver used on the Flint.
This tweak is useful for improving Wi-Fi latency and works well in conjunction with Cake/SQM on the WAN side.
You can download and upgrade the open source firmware for the Flint 2 (GL-MT6000) from the official website. On the open source firmware, we have already enabled CONFIG_MAC80211_DEBUGFS, and you can adjust the Aggregate Queue Limit (AQL).