VM won't call you - you need to call them for support issues - that said, let's see if we can narrow down what the issue is..
Firstly, are you experiencing dropouts when connected to the hub via ethernet?
can you set up aBQM- once set up, find the Live Graph and click "Create Sharing Link" - post that back here.
Next, browse to your hub onhttp://192.168.0.1 - don't log in, click Router Status - copy/paste the tables from the Upstream, Downstream and Network Log tabs back to this thread - you'll need multiple posts for this, the info wont all fit into a single one..
it'll take some time for your BQM to populate with some useful data..
in the meantime, a number of your downstream channels are outside of recommended spec on power (10 being the max) the variance across the channels is also out of spec (should be a max +/-5 across the downstream channels - you have some at 7 and some at 13.5+) - whether or not this is causing the issues you're seeing i can't really say, but it certainly stands out.
can you also post the network log?
Upstream data looks ok and within spec so it seems mostly to be issues with the downstream channels..
Might be worth calling 0800 561 0061 to see if there are any area issues - this is an automated service so no need to hold endlessly for a real person.. I reckon you'll need VM to come and comment on the quality of your line though - that can take 3 - 5 days (sometimes longer, but they seem to be getting to posts more quickly recently)
We should treat the wifi blackspots as a different/separate problem - wifi on the hub is poor, but if you have issues with the connection then let's deal with those first and then see what happens with the wifi after).
So, i don't see anything obviously wrong with the logs - but I'm far from an expert on these things - others may well have a different view.
as for the BQM - it's not looking terrible, but it's also not perfect - you're getting a few spikes and a bit of packet loss creeping in at the top (more than you'd like)
Have you managed to do any testing with a device hardwired into the hub? (request in my first reply..). I'm sure someone from VM will get to this eventually (3-5 days seems to be how long it takes at the moment).. whether or not they agree that there's an issue with the power levels remains to be seen, but in the meantime, it's worth doing some testing with a wired device if you can..