You want both, Crippling Strike for Stun efffect on Finishing Stroke and Epic Precision for more damage.
And yes Tumble is useless form Gear, you need total 14 ( including Modifiers ) to hit with a Roll of 1 the 15 to avoid attack of Oppotinity, but i disagree with the Skills you want.
Bluff for Feint? According to Zan Feint dont work properly once you hit RoT 2.8, feels useless too.
Intimidate for Demoralize Opponent? Tested few times on Event Server, dont work mostly and when i couldnt see/feel any Effect. Expose Weakness is stroger.
Taunt never tested, probably worth.
Spellresistance from Set isnt great too with only 1 x Classlvl of Swash/Thug. Racial SR is 51 and from Fullcaster Spell you get 55. Dont think it would be a balance breaker to give 55 from Set and for sure Players wants more.
Anything concrete whats the planned Special from Cloak?