Hello there!
Well, as far I can recall, I managed to solo Durumu with 679ilvl, but it was mainly due to lucky RNG. With 690ilvl (so on later attempts), the boss was killed systematically.
Again, Durumu is - and mainly is - a DPScheck. That means that you must have the 31k-32kDPS requirement to kill the boss before the lifedrain.
Here are just a few things that I've seen and that worry me :
* You're gear isn't well optimized (mastery, crit, haste, multistrike ?) It's like a rainbow of stats
. When I killed the boss, it was with a Crit > Multistrike gear (so DPS optimization).
* About Trinkets, if I cannot really argue with the first Kazzak trinket (leech, speed, avoidance - the leech is the only interesting stat here), you should replace the second with something like the one on Hans'gar and Franzok (something with BA activation anyway).
* Use some BA pot. Do not underestimate them, they're a huge DPS/survival up.
* Normal tips then, like don't forget you can use Xuen twice on Durumu, abuse of your Tiger Palm, refresh Zen Sphere at the exact moment it explodes, and so on...
About Leech, it's only a bonus stat. It won't be that efficient if you cannot do a lot of DPS (and even without), it's not that mandatory.
Monk BrM is all about seeing the damages coming, in order to foresee the use of EH instead of Jab - and thus the management of the energy.
Also, with lost approximately 4% DPS with all the shitty whining ''Monk does too much damages'' nerfs (only the case in AoE). Take them in consideration, as I recommend 685ilvl+ to defeat Durumu, with a perfect gameplay/Crit>Multistrike=Versa or Multistrike>Versa>Crit optimization.
It's quite a tough one, so good luck