DiabloFans

It is literaly like the tooltip says ...sweeping wind active AND channelling tempest rush. So casting wol or ltk would NOT benefit from the 15k cause u stop channelling to cast . But what I found out what gets the dmg boost for example are weapon proccs like thunderfury, rimeheart, shard of hate etc and of course Gem effects.

I don't think it does

But, from what i've seen (keep in mind i have not tried it myself), but if you use the explosive blask offhand, you can add stacks to your chantodo set even after you enter archon, for use on the next cycle.