Thanks for the info. I'll keep practicing with the spec and will try it on some of the 1-target operation bosses after I get it down. Here are my stats; I'm open to comments:
Unbuffed with no stims.
Bonus dmg: 629.9
Crit::36.49 (Crit Rating: 384)
Crit Mult: 75.82
Too much crit rating. Get it down to 350. Ive seen parses of 2k+ snipers with crit rating from 250 to 350. Personal preference.