Could you please post a link to the dslreports speedtest's detailled results? That way we can see the bufferbloat measurements in high resolution and less time consuming than in a video clip.
Also, please post the output of cat /etc/config/sqm. And also post the output of tc -s qdisc twice, first after a fresh reboot of your router ( so say a few minutes after the reboit, burt without stressing the network) then perform a dslreports speedtest post the output of tc -s qdisc again, then post a link to thecdetailled results of that test, please.