I repeated the 3 base champions - sometimes the sane one a few times or jumped around. Much easier with a warpainted thrall to help.
Then when you have a bunch of the 3 brands, I converted those to a bunch of the base grand champion one. And then just bought one of the grand champion potions and used that and then just stayed in there and fought grand champion over and over. He also can be redone every 5 minutes. That way you save on the 3 fangs for the potion.
I did 10 grand champions in a row. Got 40-50 fangs per grand champion kill. 40 only once or twice. 50 a few times. The rest like 43, 45, 46, 48.
With a good thrall the werebear barely moved with thrall tanking it so can just get behind and cut it up