You have a very solid build...first thing i'd do is dump that ruby out of the helm and switch it for an amethyst...if your hp is under 40k you're probably getting one shotted.
Next you might want to consider adding a little more crit chance...your crit dmg is SICK, but not doing a whole lot of good if it isn't getting a CHANCE to proc.
Consider changing your war cry rune to impunity, your all res is a bit low and with your hp under 40k you're getting smoked by E's that shouldn't be hurting you.
Keep in mind....Tornados supply life and fury...the faster they spin the more they hit....the higher the crit chance, the more crit hits you get.
Follow the link for a little more insight into atk spd and nado ticks...cheers.
For example, my offhand nados are giving me 30 ticks over 3 seconds...that's 10hits per second per offhand nado with WOTB going....to get that you must have a minimum of 2.86 aps on the offhand.