Pistol/Pistol is the worst thief weapon set, so I don’t recommend you use it.
That said, your Critical Strikes traits are fine considering what you’re trying to do.
For Acrobatics, you don’t really need the swiftness on killing a foe considering you get it on dodge and you can also equip a signet for permanent +25% movespeed. Consider taking II or III.
Your Trickery traits are also fine for what you’re trying to do.
For the second build, I highly recommend you don’t put 30 in Deadly Arts. The two Grandmasters are both bad for what you’re trying to do. Try 25/30/0/15/0 or 25/30/0/0/15.
All that said, Pistol/Pistol is still pretty bad. I recommend focusing on different weapon sets. Dagger/Dagger is your best single target damage, Sword/Dagger is great for enemies that generate a lot of boons, and Sword/Pistol destroys PvE mobs with permanent blinds. Dagger/Pistol can also work depending on the situation but tends to be better for PvP.
Shortbow is your best ranged weapon because it offers OK damage, a spammable blast finisher to stack buffs on your party, an evade attack, and mobility through shadowstepping. With 15 in Deadly Arts you can also permanently stack Weakness on anything with the 4 skill on it. Pistol/Pistol, in comparison, offers Unload spam, and that’s about it.
Personally I use Sword/Pistol for general PvE mobs, Sword/Dagger for boon-spamming enemies and bosses (think Dredge), and Dagger/Dagger for raw DPS. Shortbow is almost always my other weapon to swap to if I need to back off to range or to get somewhere else fast.
