Also, as I said, I don't have a Tasker yet, and my Krider is 2.2k dps. Obviously, I'd like to have a perfect Krider or Etrayu, but I've never had a decent roll for either of those, so saying I should get one doesn't really help me make the best of what I do have.
Lastly, I haven't played all that much since 2.1 came out, and I already got 2 gifts. Of course, RNG is RNG, but I seem to have an easier time finding gifts than good weapons, so I'm not gonna let it rot in my stash too long
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Zei is calculated as your turret distance from mobs, and while you can intelligently place turrets to take advantage of the gem, a large chunk of the gem is wasted. Enforcer gets 100% use, trapped gets 100% use from just have EA/Frost in your skill setup. The third choice is what people use from personal preference. Things like Powerful are okay for the flat 15% elite damage, but I find that the 20% damage is not up when I need it most of the time. Toxin is pretty cool because it is a flat 10% increase for everyone. Invigorating is good for some people to help with jailer damage. Also some people run with hoarder gem.
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First of all, I would change your skillbar setup. I would put elemental arrow on left click and sentry on right click. It makes it easy to place sentries and if you accidentally left click something in the world elemental arrow is cheaper than multishot.
Secondly, you have the wrong skill/rune setup. Vault needs to have the 50% reduced cost on second vault so you can vault more and on demand. Remember that since you can't have both vault and smokescreen, you have to use vault like smokescreen. You are immune to damage for 1 second while vaulting the same way as smokescreen, but you get the benefit of rolling through mobs. Vault>smokescreen once you get used to using it in this manner. Also, your elemental arrow needs to be frost arrow to trigger slow effect, which we will take advantage of with a change to your passives and gems.
Okay, now that your runes are setup correctly you can change your ambush passive to cull the weak, and swap out your miniconduit gem for bane of the trapped. Congrats you just got 40% increased damage for basically nothing.
If you are having problems living then there are a couple of things that you can do that will increase that nicely. First of all, change the gem in your helm to an amethyst which will increase your health a ton and you won't notice the slight increase to sentry drops. Also, dex classes rely on dex for armor and paragon/gems for resist. If you swap out your dex gems for diamonds it will boost your ability to live when you do get hit a ton at a minimal loss to your dps. You can also run with aughilds bracer and shoulder to gain 15% damage increase and nice damage decrease as well. I also prefer to go with the toxin gem instead of elite gem because elite gem is not active when you need it most and now that sentries stack it you can get 10% increased damage all the time for freebies.
There are lots of things to redo on your gear, but guessing on what you have rerolled you know what to do and are just hoping for rerolls to land.
There are some other things, but that is a lot to start off with.
http://us.battle.net/d3/en/profile/Tyrean-1721/hero/51707672
Here is my hardcore DH as a comparison. I can do T6 rifts in about 6 minutes, and I can do grift 31 in about 11 minutes and could probably do higher completion once I get unity. DPS is there easily with my 650K sheet dps because of the way everything stacks up. 20% steady aim, 20% cull, 20% pet gem, 20% slow gem, 10% toxin gem, 20% calamity, 41% sentry, etc.. it stacks up quickly so you don't need tons of sheet dps to do realworld dps.