I would definitely tell you if I knew. If I get there before you get your answer, I'll be back to tell you!
Make sure you have the Shield of Want on your back, the Symbol of Avarice on your head, and your Covetous Silver Serpent Ring on your finger to get max souls from the knights.
I get roughly 90k per run at NG+2, but once I get every item in the game (all I have left are covenant-related items), I'll speedrun to NG+7 and beyond to grind for lvl 300 (tens of millions of souls there, if not 100m+...).
...in case you need a quick look at specific data or where to locate them.