I'm just still keen to see the results of the speedtest.net app, because so far there hasn't been a single piece of evidence to suggest there is actually an issue that needs to be solved.
If that delivers good speeds it's just the usual PC issues and limitations of browser based testing and there is no actual issue.
If that delivers poor speeds the issue is either MR, CHorus/LFC or the PC (and it wouldn't be the first time I've seen a post on here describing a PC that could deliver 800Mbps that now can't after an upgrade)