Sounds like another case of congestion that an operator is brushing under the carpet.
So to get this right, you already had a hard to achieving 200mbps and then upgraded expecting better?
Share you stats from hub to see if we can identify any other issues by doing the following, otherwise don't be hopeful of a fix anytime soon.
Hub Stats:
Open http://192.168.0.1/ or http://192.168.100.1/ (if you have your Hub in Modem mode) in your browser
For Hubs 2 & 3 - DO NOT LOG IN, just click “Check Router Status”
For Hub 4 - When the page appears LOG IN then click on: Advanced Settings > Tools > Network Status.
Please copy and paste the contents of the Downstream, Upstream, Configuration and Network Log tabs in replies here.
If this is your first time you may have to do first setup of hub password.