Been playing with this for a little while and really like it. http://gw2buildcraft.com/calculator/engineer/?2.1|a.1b.h5.e.1b.h1|0.0.0.0.0.0|1b.7i.1b.7i.1b.712.1b.712.1b.712.1b.712|1b.9b.1b.9b.1b.9b.1b.9b.1b.9b.1b.9b|u58b.a6.0.k19.a6|31.e|2c.2f.2v.2x.30|e
Gear is mostly rabid. Condi damage is self explanatory. High precision is key because so many bleeds come from crits. Toughness is for survivability but you had better be a good shield user to last long against zergs. With Veggie Pizza I can keep condition duration at 80% for base and 95% for bleeds and poison, which are like 80% of this builds sources of condi damage. You should have a second pistol ready for when your condi stacks get maxed.