I'm in agreement with Andruser - looking at your graph, it doesn't appear to be a utilisation issue. Despite this, things may not always be what they seem - but it would be prudent to exhaust other avenues first.
Having a quick look at your stats, your downstream (7.8 - 9.3) is slightly on the higher side of recommended levels. It's technically "within spec", but not ideal. You may wish to have an engineer visit to help bring the levels down slightly. Anything over 8dB is considered a "bit high".
I will highlight that if you signed up to Virgin for gaming purposes, then compared to the "average" ADSL or VDSL connection that you might get with an Openreach-based supplier like BT or Sky, you're going to see higher average pings with Virgin - this is just the nature of DOCSIS technology that Virgin's cable-fibre broadband is based on.
My first point of call is "check your Coaxial connectors are tightened". Loose connectors can sometimes cause noise to muddy things up a bit. Get all the connectors finger-tight, and then give them one more turn with the plastic spanner they bundle with the Virgin Hub, or find your own tool. One turn though - having things too tight can cause you different problems!
My second suggestion is "get an engineer to visit". Your downstream levels are slightly too high and worth a look at.
I wish you the best of luck in fixing this! Again, it doesn't look like a utilisation fault, so if you can get the latency issue resolved, you could have a very good service right there!