Yup! I'm totally in accord with you! And I agree, before 2 days ago, I didn't even think of putting points in that +1% dmg per 2 Trait Points. Though the Crit Chance for Stealth-Enhanced Skills, as you pointed out, only will apply for those 2 skills in rotation, so once every rotation. While, sure, those skills WILL, in the end, deal more damage and I agree, if you check how I'm set up, I'm ALL about Crit, but in a maximizing point of view, I believe at this point the flat damage bonus might end up in a better total damage output.
Though at this point, it's tweak over tweak, I just have nothing better to ponder about regarding my toon as it is. Especially since I don't even play any other character, nor go about in the Moors. If I'm not attending a concert, planning the next, testing new songs or writing some, I usually just stay up on the fence in South Bree in wait to surprise anyone I know with a /tickle coming out from Stealth. In wait for to help somebody.
EDIT: And yea, Gambler's Advantage is alright, since it benefits from all those bonuses, just the DoT following is slight and it only is a one-hit attack compared to the other two. Its damage still is high, on any Crit Chain skill I rarely NOT crit, thus its damage revolves around 5,4k+ if not mistaken.
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From left to right : Mr Grasdur, Mr Tromblon, Miss Piperia, Mr Bredouille, Mr Chapelier, Miss Marre Annette, Miss Fincin