Tube rolling question for VK75 SE owners

Hello;
I am looking for any feedback, recommendations, suggestions and experience
from owners of BAT VK75 SE regarding tube rolling (6SN7 & 6V6GT).
What sound best, make this wonderful amplifier even better or create
best synergy with this amp? Any problems with NOS tubes?
Did anyone tried Brimar CV1988?
Please, let me know. Your help is very appreciated.

Thanks, Jack.