Make an effort to reestablish a balance in PvP. As a start you should remove the buy-able potions from PvP. Can be as simple as adding a equivalent negative PvP effect.
PvP always boils down to a advanced graded rock-paper-scissor game, where two equally skilled/geared players should almost always finish with the same result in a duel, same goes for group fights. Only skill and some small part of luck should be able to change the outcome. With the potions in effect the balancing effort is made extremely more complex, and virtually impossible.
PvP is most fun when its competitive. Ofcourse its fun once in a while to completely dominate the other side, but its even more fun when you know this is mainly due to skill.
Age of Conan has the potential to be one of the best PvP MMOs, allow it to once again fulfill its potential!