Help with Cyclone CoC Discharge build

So i trawled around and plonked out a skill tree for a Cyclone CoC Discharge using Malachai's Iron Mask for Blood Magic and of course Voll's Protector.

https://poebuilder.com/character/AAAAAgAAsZAtqNtZt9aDCXcHhxOcpG-ewONLV_GzFr8Pq1M1m7XDOspKVUth4iaVjDaXl_v1tDjlGaSRE55d8n4zcFKJ03DV8-oqC5oTcFaQGxGWDkjb1GND44RsjJ2qNj1irLl8jAvssNQjBbXC7LTFOkJLeN2oMHHWin8rMHxRR42_TZIj9o19_94k_edUiq-QEYLkvrxKyP4K2L01krXybqq3Pn69l_48Lcau73yDOBRN8B_Fiq9sTP-iAIcZbBb8SyftxPblz5J9mG9Z86yqwBqnhJBVGjjsOClPgpuFfUV8Kjipbg==

Now my main concerns are:
1. Is the usage of Blood Magic worth it? I had previously tried to make a CoC Discharge but using Voll's meant that I had mana issues and couldn't even support the mana cost of Double Strike, much less Cyclone. I suppose I could run a low level Clarity though.
2. If I was to use mana instead, would I need to grab mana and mana leech nodes from the tree?
3. I would like to run the Grace aura and maybe Purity of Elements to bump up survivability. I'm not sure if Vaal Pact alone can save my bacon as I've never tried it.
4. I got to Sentinel via the Scion's close by elemental resistance nodes but are the evasion nodes from Reflexes better? Like so: https://poebuilder.com/character/AAAAAgAAsZAtqNtZt9aDCXcHhxOcpG-ewONLV_GzFr8Pq1M1m7XDOspKVUth4iaVjDaXl_v1tDjlGaSRE55d8n4zcFKJ03DV8-oqC5oTcFaQGxGWDkjb1GND44RsjJ2qNj1irLl8jAvssNQjBbXC7LTFOkJLeN2oMHHWin8rMHxRR42_TZIj9o19_94k_edUSsj-Cti9NZK18m6qtz5-vZf-PC3Gru98gzgUTfAfxYqvbEz_ogCHGWwW_Esn7cT25c-SfZhvWfOsqsAap4SQVRo47DgpT4KbhX1FfCo4qW6sR1FMPycqTX1b

Thanks for any help, I'm currently levelling with Crit Reave until I'm back to lvl 45 to wear all my previous CoC Discharge gear.

i use EB and warlords mark + assassins mark dual curse on cwdt and herald of thunder curse on hit for mana regen.

i think acrobatics isnt worth it, since u dont have much life.

u dont need purity against reflect with vaal pact.



my current cyclone CoC version with cold snap and ice nova, a more tanky variant cause it perma freezes everything except for map bosses and doesnt need life leech gem, the increased aoe gem helps a lot against desync.
https://poebuilder.com/character/AAAAAgYA5Rm0OPv1l5dFfIw2YeJVSxa_JpXfhAL-XfJCw3BSidNw1fPqKgsOSGNDf8YRlsHzoqMtH5Ug2wuCHkyzPV9SU5eVUDDbXhEPrJhJUfDVlS4HHmpDwFS86msXXyp0VVXGOlj315uhj0YdFPrSZp7AGho4p4SQVYV9FkBZ86yq5c-SfZhvJ-2HGWwW_Es8LcT2fr2X_uNqNumaE3BWkBvb1Ll8jAvssDY944RsjJ2qYqy18jWS2L3-Crc-xq4qOKluCLE__OhmeA2iAPAfxYqvbEz_FE3vfIM4
gear