Hub status data is mostly excellent - there's a couple of channels over 10 dBmV, but only fractionally and I wouldn't see that as causing problems.
The BQM however shows a typical over-utilisation pattern - you see how it's very poor during normal waking hours, and then peachy from about half past midnight to 9 am? Shows that the network and your hub are working perfectly when there isn't too much traffic. As you've got a Hub 4 on an M350 connection, that suggests that there's been a utilisation problem there for a while?
The Hub 4 and DOCSIS 3.1 are supposed to help with over-utilisation, but as far as I can tell, that's en masse, not at an individual connection level, what's more the benefits are moderate (around 15% additional bandwidth) and I suspect won't help with upstream issues. Looking at the BQM's shape, I'd hazard a guess that the dominant utilisation issue around you is daytime working from home that puts most pressure on the upstream.
There's a good chance that this is Covid related so it might go away as and when we get back to some form of normal, so give that some thought. The alternative is to invoke the VM speed guarantee, as you have speeds that regularly fall below the minimum. Doing that gives the company 30 days to fix the issue, or to release you from contract without penalty (which may or may not be an outcome you want). If invoking the speed guarantee, read up on the policy and the small print. In essence you need to show that on at least one occasion on three consecutive days the speed was below 181 Mbps.
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