Help with fire arrow build

I'm building a fire arrow build but i'm noob in this game. I feel my build is too weak. I barely survive in merciless.
5 Link: Burning arrow + Add Fire + Weapon Elemental + GMP + Elemental Focus 4 Link: Faster Attack + Rain Of arrows + Physical projectile attack + Add Cold 4 Link: Split arrow + Poacher's mark + Curse on hit + projectile weakness on boots: Arctic armor + summon ice golem + haste
http://imgur.com/a/BiXmS




https://www.pathofexile.com/passive-skill-tree/AAAABAIAAABeAO4FLQVmBiMILg2NEYEVIBmKGY4i4iPTI_YknSU_KjgqTSzpMHwx-jWSN9Q51DqzOuE_J0MxR-JKyEz_TZJN404qUUdW-luvYlpjp26qbydv8nTtdvd673sUfyuGs4dBjX2PYJAKlQWXBppqm42gn6GkpDmmV6fUq9K0GrXywzrEotN-1ljYvdqN2sHdRt-Y4J_h2-0_7YPuDu968kX2o_zF_gr-j_7I

What i'm doing wrong?
How can i improve it?

Thanks.

Wouldn't Elemental Focus stop your attacks from igniting? The bow seems to have lots of synergy with ignite, it might be a waste to socket Elemental Focus and lose ignite. Perhaps replace it with Fire Pen.

I would drop some of the mana leech nodes and grab King of the Hill node.