On my first attempts I went with a full haste/mastery gear but it didn't worked for me. Then, I swapped some pieces of gear, increasing my versatility and trying to keep my haste in a good % (22% haste/12% versatility aprox) and I noticed a significant difference.
In spite of my versatility increase, my health went down a lot of times, like a yo-yo, but it's a matter of getting used to it. Saving IP on mind rends and then VR eyes were my ways of quick health recovery, and orbs as well.
On Ph2 I didn't have hp issues after reflecting twisting reflections unless I stepped on Kruul's green field. That's why it's good to keep moving and saving leaps/intervenes.
About legendaries, I can't suggest something relevant cause I didn't test other leg than bracers/belt combo (and yes, they are op af). In your case, I'd use Sephuz for extra movement and gloves for damage. IMO shoulders are too redundant and Walls Fell is meh, but again they may be useful (maybe stats increase, I don't know
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