Engineers removed the attenuator the last engineer had placed.
They also replaced the connection in the pit as it was slightly corroded. I live on a hill and it fills with water a lot. They are supposed to be waterproof/corrosion resistant but that's a big ask. I guess it will go again eventually but the engineers (guy had a trainee with him) were bang on and even left me with a spare length of coax I asked them for so I could move the hub away from the back of my TV altogether to cut down electrical noise/interference.
Im failing to see the issue here, all the graphs you compared yours to are near identicle for latency, yours showa intermittent rises which look to be related to usage on your connection.
I will level with you now and tell you that your not going to get better latency that you have now with Virgin, you will have to switch to DSL based or full fibre service and ensure you manage the connection right to ensure priority of gaming traffic.
When I used to be **bleep** about latency in online gaming I had a basic ADSL service dedicated for gaming online and kept the fast VDSL service for everything else at the home.
If I've helped let me know 🙂
10 year's managing 9 Virgin Media accounts, and things never got any better, closed last 4 accounts since January 2021 :L