I would have to go for the option to start the HoF anew for the combined servers.
And hopefully this time we make the 3x HoF as comprehensive as the slow server one.
I don't know if this is true for the slow servers but a lot of the Ukx records are now outdated considering all the changes the games has undertaken over the last few years. Servers dont last nearly as long as they used to and defence points are now awared to the actual defenders.
Starting the HoF anew has to be the best option.