Slayer claws+leech+block skill tree help?

Hello, everyone. I'm trying to create a slayer build based on claw dmg + life leech + block (both phys and spell)

I'm still in progress with items (which will get me spell block, btw).

For now, i'd like to know your opinion on the viability of the passive skill tree for melee character on Legacy HC.

I greatly appreciate critics and advises.

Here's the passive skill tree along with the approx item build

http://poeplanner.com/AAcAAV8UAACDAdwFLQW1CVgLwQxzDY0RLxXsF
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I'm planning running enfeeble+warlords mark curses as active debuffs (+1 curse will go from Cospri's Will), fortify support, grace or determination aura as passive defence.

I know I need as much sustain and def as possible. That's why I'm here, asking for more guidance on defence and survailability in general

Bloodseeker and Rare Claws will probably go as main late game weapons

so you put all these effort to hoard leeching, yet forget there's a flask called vinktar? that's 20% leech and if you only have 50% phys to lightning, that's still 10% leech with only 1 support investment, find a way to keep clear speed fast so you can sustain vinktar is way more practical, hint: the retch


170% life at lvl 100 with not a serious amount of armour, evasion, dodge, and 40% something block , i don't think you can suffer the grind, you can try, it will work to some degree but it will be meh.