I'm sorry if this has already been posted. If it has, I am sorry to have bothered you.
I think the EXP loss should be removed from PvP system, if not lessened. After all, it's not whether you win or lose, it's how you play the game. Making you lose rank from losses contradicts this statement. What if you had gone second and if you had survived that final hit, you would have won? What if you were unlucky and fizzled more than usual? What if the opponent was a higher level/pvp rank and had access to better gear than you?
I am not complaining, but I do get frustrated to see my PvP XP go down from a loss after otherwise well-fought battles by both players. Winning isn't everything. :)