Build focusing on Dirty trick and sneak attack (need advice)

[Nosta]

what should I take for the final 8 levels of the following Build: Unchained Rogue (Swashbuckler) 4 / Brawler (Snakebite Striker) 2 / Slayer (Bounty Hunter) 4/ Fighter 2

Feats
Accomplished Sneak Attacker
Dirty Fighting(B)
Dirty Trick Master
Equipment Trick: Smokestick(B)
Greater Dirty Trick
Improved Dirty Trick(B)
Improved Unarmed Strike(B)
Iron Will
Lunge
Surprise Manuever
Weapon Finesse(B)
+1 Feat
Traits:
Adopted->Intrepid Volunteer (Dexterity on Dirty Trick maneuvers, Halfling trait)
Any +1 Will trait

Main Items
Goz Mask
+1 Keen Waveblade (with weapon cord)

Combat Strategy: With one rank in Craft: Alchemy, the Equipment Trick feat allows you to create 10 ft cubes of smoke as a swift action, which lasts for 1 round. Since Brawler's Flurry leaves you with one hand free, you can carry the Smokestick while flurrying. The Goz Mask allows you to see through the smoke, while you'll use Lunge to attack from 10 ft away and benefit from Total Concealment. This lasts for 1 round and will hinder enemy ranged combatants from targeting you. If they decide to blast your general position, you have a great Reflex save and Evasion.

Total Concealment should be enough for Sneak Attack, otherwise you'll have to blind your opponent with Dirty Trick or flank them.

Whenever you'd be able to Sneak Attack a studied target, you can choose to forgo the extra damage to instead make a Dirty Trick Maneuver (with a +3 bonus) as a free action.

I am just not sure what the last 8 levels of this build should look like to get the most out of it

[Florian]

Not... so good. At that level, enemies with blindsight/tremorsense begin to be common, so a low level trick like your equipment trick doesn't really help, any level of wind would instantly disperse the smoke. From an economy of actions POV, either getting Dirty Trick as a rider effect and/or using it as an AoO would be a better way to set up a sneak attack without a flanking buddy.