Scion Barrage Poison Build

Here is my build https://www.pathofexile.com/account/view-profile/Banamibi/characters , I'm working on an original build and after several failures could get to that point. My character can do atziri, uber lab, I have not tried yet uber atziri, because I'm still new at the end of the game but I think it could do so.
I made this post to see if it really got interesting my build and some tips to improve it.

Thanks :)

Here is the build at lvl 100 (and the bow i will use is Reach of the Council).

https://www.pathofexile.com/passive-skill-tree/AAAABAABAHtulyHBfIcHpq8dwuKtCdnKRjE18pebXaiae8NaUkrIbqq18jWS2L2bjQgu7YMZjgBe0359df66r-sB0aJA9PihIsSip9T-yBsBGf4GIxXw-WOVzO0_o4oj9k2SjX2Nv9QjMHHdqEt4OkIFtcLsBnBOn3p_tMVirGyMnao2PetjES8rCl3yDkgRlgcelS7w1UlRj_pcQFS9Fe2Wi9W5tUh2gsgMtNEWv2qM9W_IFKLZsNgmlWHiVUvuDvzFDY1br04qTP9DMY1-t7Z1y-pivqdlTb02Ax6PYNrBdO0FLXrvv9VTuy5T028knWJacbDI8NZYH0GS8_rrRJ5Hfv6PTeOmV4d2459KfWegXkU=