Help with Obelisk -Cold Storm Call

idk why deal so much demage its Cold Storm Call to a wave of elemental damage that spins around

my build i have 4,3k hp and 77% all res -60% chaos

http://www.pathofexile.com/passive-skill-tree/AAAAAgEAAecEswmWE0wTyRQgFE0UcRfhGJEZLho-G_ol3yb4J-0pLjB3NZI26DkOOlI64TwtPfxM_04yUEdVqVcNWGNZ_l8_ZFJko2WnaPJqAXKpdqx8uHzZffWCB5d5l7SezZ_LogCkGacwrY2uUK9stiy3PryfwGbBo8RYxPbGrsbYz37SIdi92WHZfOJh5FHvDvAf8azyL_JB8kXynPZI9zL46_xL_gr-aw==