This is mine over-utilization BQM from yesterday (19/01):
https://www.thinkbroadband.com/broadband/monitoring/...
Your BQM does seem to indicate a level of over-utilization during the busy hours. Notice how the latency gets lower during 2am to 8am.
Given the spikes in the graph you might experience some lag during gaming.
In my case is more pronounced as I'm having a high level of packet loss. This makes VoIP unusable.