CRIT and damage

Ive got a 60 rogue with tier 2 head and some tier 1 and perd blade. i get nice crits on my backstabs, but how can i get higher crits in general? Agg/ap? ive tried to mix types of gear, but whats the ultiamate stat to focus on?

Weapon Damage + Attack Power?

Agility is your primary stat. Each point of agility gives you 1 Attack power, some dodge, some armour and some crit.

29 points of agility gives you 1% crit, and 14.5 points of agility gives you one dodge.

If you want higher crits, you want weapon damage primarily (not DPS, actual damage) and either attack power of agility. 20 agility > 20 AP, but you’d probably benefit more from 40 AP than 20 agility.