R7800 - Fibre modem passing slow speeds
Recently moved house and went from a DSL connection to fibre. This came with a new ISP and a new ISP provided modem/router. ISP is virgin media, modem/router they provided is a SuperHub3.0
I can connect the nighthawk to the modem successfully (having the ISP modem in both 'modem' mode and 'router' mode), but I only get a max of 90Mbps on both wifi and ethernet. Using the ISP provided modem/router I get 220Mbps on both.
Tried on both most up to date firmware from NG as well as Voxels.
First question would be - any idea on how I can resolve this with the current equipment?
Follow up would be - if not, what devices should I replace, and with what?