If we're talking about PvE, you might as well go put points into DEF rather than EVA since bosses naturally have high Accuracy. Def helps prevents you from getting one-shotted by a boss skill which is nice since you can probably get your hp back up with the help of skills and passives.
Duelist x Ravager- fixes the AoE con we have but you can do just fine if you position yourself properly. Slash Cut + Deadly Wink + Dancing Balisong, try using those. The con to having ravager is if you're forced to fight ranged combat if the boss/player is too dangerous. E.g. Bosses that perform 8-way AoEs. On the bright side, Ravager brings more melee skills to the table as well as a useful ranged slow and stuns.
Duelist x Sorcerer- I main this one myself and it's a bit of a love/hate relationship for me. The debuffs and DoT is nice but if there's ANOTHER sorcerer in the party, may they be a main or sub, they WILL overwrite the skills you inflict with their own so you won't benefit from various effects, aggro gain, lifesteal etc. In pvp it's good because of the stat debuffers as well as a ranged snare for those pesky kiters. This combo does not have stun just so you know. It does have snare and at lvl52, sleep.
Duelist x Gunslinger- I plan to go for this one in obt. Ranged option and traps aren't half bad. Though when it comes to traps it depends on the enemy player's brain and the server's latency.
Duelist x Guardian- Popular choice from what I've seen. They have a stun, another gap closer as well as useful buffs. The def buff tends to lose out on usefulness though at later levels when everyone is expected to cap DEF. Also accidentally using Intimidating Roar in a endgame instance will not only earn you hate from monsters, but players as well
keep in mind you're not the tank class, unless ofc your tank is downright horrible when it comes to stats and aggro holding.