[Bloat] unfixable bloat on Cable modem CODA-4680 (puma 7)

[cloneman]

I'm getting a weird problem with this new modem , it's Docsis 3.1

latency/jitter measured via ping is about ~300ms during download pressure
of 3 http transfers. The latency doesn't appear on synthetic bufferbloat
benchmarks, though. (dslreports ; 20ms ("A")

question: trying to figure out why I'm seeing this particular behavior, and
determine if it'd a real issue or just an anomalie with ICMP traffic

I've not seen ping do this with other modems.

Perhaps I need to try some other traffic generation/ capture  tools?
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