I've only done one build with dexterity/health/endurance and just enough faith and attune to cast a heal and a spell shield for PvP. Bandit is the perfect template for this because of 1 intelligence and 9 starter faith. 20 Adaptability minimum for all characters unless your plan in life is to fatroll through PvP which is a good way to lose all your duels.
I've been using a single falchion I found at the beginning of the game and a target shield for almost everything. Wrecks people. I've won >80% of my PvP. With how easy it is to stunlock people in this game, I think that I can most of the time just drain my whole stamina bar into my main-hand falchion light attacks, which, when on paper, means that dual wielding seems a bit unnecessary. It's worked pretty well so far, and it looks reaaally cheesy locking someone down for 6+ swipes. That, and getting good at parries in PvP makes you a god. Seriously, yesterday I dueled this same tryhard invader with a dual-sided staff weapon in PvP, everybody hates those weapons, but since they have such announced and predictable attack patterns, I was able to parry/execute the guy all 3 times and make him look like a tool.
Parrying does suffer from lag though. You have to parry when you think the enemy is about to attack because lag is not on your side, but man when it works, ooooooooh dat feel. It almost always one-shots someone who doesn't have a lot of health or armor and has a slow-mo animation of you executing the guy flinching out of fear and some really crunchy sound effects. Using certain weapons does more damage. You can switch out to a dagger which gets bonus damage for this type of thing since a parried player is just sitting on the ground stunned for quite a while.
I think it has more to do with your equipment than your build. It's gonna be pretty expensive or even difficult to upgrade a new set of gear if you're even going to change armors along with your weapons. Although, looking at your stats of high int and faith, I'd say there's some hexes you could really be taking advantage of. Some of them work by taking your lowest stat, either intelligence or faith for the scaling. Having high of both would scale the damage nicely, but everyone is gonna hate you in PvP 'cuz hexes.
At least I think that's how it works. I've never done anything but Falchion/small shield bandit in DS2.