If you want to play with 3 rogues and focus on very aggressive opening, you should go for a more aggressive talent build as well.
I don't play a rogue at the moment, but I think something like
http://ptr.wowhead.com/talent#ryiE|may suite better for your intentions.
-Nerve strike stacks with mortal strike and wound poison so you'll have a massive healing reduction on the enemy, making it a lot easier to outburst their healers.
-Leeching poison is pretty terrible for arena, not only you can't use para/mind poison, glyphed elusiveness happens to be much better.
-I prefer ShS over CnD, but I think both work for a burst orientated comp.
-Both para poison as Prey of the Weak are viable, but I prefer the utility of para poison...
-Shuriken Toss, well yeah, ranged attacks are nice when going with so much melee.
Again, I currently don't play a rogue, I'm to lazy to ask my ex-partner for help now, but I think the build I just made in 2min time is a bit better then your current for your intentions.