Duelist with low DPS, need help

Things are moving forward and It feels like I'm getting "there".
So for starters, my Tree is very close to what Juan suggested and today I finally got to have Resolute Technique which is awesome.
My current tree:


Now, today I finally got my 5L chest to have the colors I wanted, only took 15 (+10 previously) chromes to get there, went from GGGRR to GGRRR.



Now my dual strike went from 14K to 19.2K when I attached the Added Fire Damage !
With hatred I am now hitting 24K DPS ! sweet.
My mana is running out very quickly now, I should do something about that...

P.S.
I also found this white 5L 2h sword:


Estimation on its worth ?

I was in your position not long ago.

Can I suggest that you swap out added fire for blood magic to cure you of your mana problems and at the same time frees your mana pool to add another aura, namely grace.

As for your 5link, I would drop faster attacks in favor of melee splash (R) so you can clear multiple enemies faster.

I was lucky enough to find a tabula rasa early on and could experiment with various 6 link combos and finally settled with double strike (I was using a 2h) - melee phys dmg - multistrike - melee splash - blood magic - faster attacks (LGoH if it was dangerous). GRRRR G/R

A tabula rasa is great and i recommend buying one if you have 3ex. It allows increased dmg as well as the use of a blood magic gem. The lack of defense is not a problem as you will have grace+hatred+reduced mana. This is what I used all the way until I was able to afford a legacy bor.

I made some great progress since my last post.
Now dealing 30K DPS and when using Hatred(my go-to aura), I get 40K DPS.

Now I'm dealing with Mana issues, since using Dual Strike + multi strike (and other support gems) produces high Mana cost (56) and very fast attack rate (0.13 attack time = ~7.7 Atks/Sec).

Reading about mana and life leech, I learned that there is a recovery rate cap, 20% of maximum life for life leech and 12.5% from maximum mana for mana leech.

My current max Life/Mana are: 3260 and 414.
So, let's say I don't use Hatred any My DPS is 30K.
For life leech: my max recovery rate is: 3260 * 0.2 = 652 Life/sec
Using my current DPS, I only need 652 / 30,000 * 100 = 2.17% of LL.

For Mana Leech: my max recovery rate: is 414 * 0.125 = 51.75 Mana/sec
Using my current DPS, I only need 51.75 / 30,000 * 100 = 0.1725% of ML.

Conclusions:
1) looks like my current 10% LL from Carnage Heart is an overkill and 2% LL from other gear is enough.
2) I need some gear with 1% Mana Leech, to help recover Mana.

B.T.w,
How do you get to have more than 1 Aura at one time ?
I am using Hatred Aura + Reduced Mana and I can only get 1 Aura due to the high (60%) reserved mana of Hatred.