Do you mean help with getting the 16Mbps back?
no modem/router would get it back since cross-talk is a side effect of FTTC which can not be dealt with from the user side by any means, it is the owner of cabinets (OR for ex. in UK) to apply vectoring which can greatly reduce the cross-talk effect.
I am sorry but if the current hardware is not having modem / router functioning problems then you should not spend money on another one, the only difference between old and new one (except for better wifi or additional features) will not be other than +/- few Mbps due to using a different chipset (or different PCB design in case of same chipset), even the Plusnet Hub 1 you have could lead to a DLM kick in due to the chipset change but 100% it will not get the 16Mbps back.