Eh, not a big fan (no offense). Appreciate you not recommending Jeff Green though.
Where is everyone holding their PVP matches? Are they just Invading? Because the two Covenants specifically for PVP barely see any action.
Iron Keep bridge is usually rife with signs to engage in duels, mostly honorable duels as well. The belltowers are good, if you think you can win 2 invaders at the same time. Wearing the Delicate String and hanging in the DLC area or Huntsmans' Copse in NG+ and onwards gets you invaded relatively often. If you have a huge amount of Token of Fidelities, the blue arena is pretty good.
For infinite PVP, get to Wretch -status; You simply can't stop the PVP train!
Edit: If you're really lucky, you'll find a fight club; A host who summons multiple dark spirits so they can fight between themselves while the host cheers from a distance. Super-rare though, unless you know of one beforehand.