If you are not on a superhub it might be worth getting a free speed boost to 50/70Mbs so you can get a superhub and get 8 channels and not 1 channel to download from. Won't cure the over utilization but should alleviate it somewhat as more channels.
If already on superhub, ignore.
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I appreciate you posting back on the community and apologies that you are experiencing slow broadband speeds.
I can see the high peak time traffic fault in your area which you mentioned. Our engineers are still working on this to improve bandwidth. The reference number is F004892579 and with a review date of 8th February 2017.
One of my colleagues will be in touch shortly with more information in regards to this.