In particular the paragraph titled "Hub 3 observations".
Disclaimer - I don't work for Virgin Media. I'm just another VM user trying to help out so my answers may be wrong If my answer solves your problem please mark it as helpful as it may help others My setup: Vivid 200 Optical fibre with Superhub 2 in modem mode connected to a Netgear R7000 router. Telewest/VM user since 2001.
Welcome to our forum, I am sorry we took a while getting here. I do wonder whether your problem is entirely down to buffer bloat as we have a issue with high peak time traffic on your segment . The reference is F004186604 and would like to carry out some upgrade work. The review date is currently showing 01 FEB 2017. Please accept our apologies and if you would be so kind to wait a few days one of the forum team will be in contact to discuss further.