PoE Assassin, Frostblink, Channelling builds

I'm looking to make a divine ire bossing build. 40% damage while channeling doesn't do much against bosses but damage looks OK I'm looking for things I could incorporate to either increase damage and cast speed in expense of defences for bossing. But also I'd like to make a variant for slow mapping investing on defences (I have no idea how to do this but I'd have to drop doryani I guess).

POB :

Hi, i've done my first coc ice spear on asasin. I was following few guides, and it still feels bad. I'm dying few times on T16 maps (not even hard ones). Damage also doesn't look as good as on youtube. I've spent like 80-100ex, and this is my pob: . Could You guys please help me fix it?

So with the release of the 'monsters deal 25% less damage, 50% more life' I think Assassin benefits more than anyone, especially because Opportunistic grants -20% less dmg taken when 2+ rares around, and 8% less from Infusion results in enemies doing 0.55x the damage. I somehow got 400k sirus DPS with severe restraint in terms of the items I chose not even counting the release wave damage. Scorching. This is obviously a template and not a full build but I'm surprised at how good the numbers look on this. Comments welcome.