I had a similar issue with my previous cable modem, whatever I shaped to didn't matter, I still had long delays. I "fixed" it by continuously sending a stream of empty UDP packets upstream:

hping3 -2 -d 0 -s 10080 -k -p 80 -i u150 IP-OF-FIRST-OUTSIDE-CABLE-HOP-HERE

On 21 July 2018 at 22:36, Dave Taht <dave.taht@gmail.com> wrote:

This is my "inbound trying to shape a cable connection" smoking gun.
The delay curve is the same
shaping the 110mbit cmts down to 85mbit OR 55mbit.

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