From the Report I would say I am influenced to try a E-6SN7 and give the KR a breather for a 100+ Hours before seeing how the comparison works out in my system.
Until discovering this thread I was set on trying out Linlai 845's as I thought I was finished with input tubes selections on the Power Amp'.
The idea of having the KR and E-6SN7 on board to be used along with the exchanged 845's does seem to be a improved preparation.