well dont add PI as main farm/pvp zone coz its boring + all servers have it. Think about some oldschool zone like DVC, Ketra/Varka (kind of midschool), maybe Cruma Tower, IT (big hall when great mass pvps can happen), Cave of Trials etc.
Make just 1 custom zone for farming (for PVP i saw u already have 1) so there wont be much ppl spread all over the L2 Map. U have to force ppl to join only 1 (max 2) zones so when ever u go to farm/pvp u see ppl to make pvps not just to play hide and seek coz u will need to search for them + if not server seems dead coz everybody are elsewhere.
What about buffs duration and buff limits?