I am sorry you are having problems with speed, the area does have a few peaks in the evening but overall it is not too bad and makes me wonder if something else is going on. The hub and line levels nicely in within specification. I notice that you are in modem only mode, are you using your own router, it may be worth trying a wired device directly in the hub to see how that goes (may require a hub reboot after connecting to obtain an IP).
What speed test site are you using by the way, if you are not using it already we would recommend www.speedtest.net leaving the default server as this will normally remain on our network.
Could you check the notes on the account? you will see i've been through this twice before regarding the 300mbit line, i've had everything replaced including the cables coming into the house, tried with and without my own router.
The time's before as soon as i got the 300mbit line my speed dropped lower than the 200mbit line, the last few nights i struggle to watch a youtube video without it buffering and same with twitch.
The best speed i've seen is 15mbit faster than what i got on the 200mbit line and that was at 2am, during the day/night i have no chance of getting near 100mbit nevermind 300mbit.
The last 2 times i was told there was a problem in the core network in england that was causing problems here but most people dont know whats going on.
Engineer out today and can't do anything as it's area wide slow speed's but after speaking on the phone again they said they don't know why the engineer has said that as speeds in my area are fine, no faults and no problem's and my speed only has problems when i upgraded to 300mbit.
So i have downgraded to Vivid 200 Gamer with 5mbit download and now they want to send another engineer out as there's a problem with my SNR even tho the last 3 engineer's have said there is no problem so either all the engineer's are stupid and refuse todo any real work or the many many people have i've dealt with over the phone and forum staff really don't know what there doing.
So upgraded 3 times in 1 year to the 300mbit and each time i suffer with slow speed right after i upgrade and i'm forced to downgrade but this time is the worse.