711 + 8.19% * SP is the base value for EF at one HP.
So shouldn't it be 711 + 8,19 % * SP * 3 * 2 (for EF selfcast) * 2.6 (for 5 BoG Stacks)
In which case we'd need roughly 440k AP (which translates to about 350k vengeance) to get 220k SP to reach the 300k HoT.
That's a 300k Hot every ~1.8-1.9 seconds.
Sacred Shield would absorb roughly 180k every 3.8 seconds at the same Spellpower value.
So we're comparing a 300k hot every ~1.9 seconds to a 180k absorb every 3.8 seconds.
How do we ever reach 50% Mastery, by the way? Wouldn't that require 25k Mastery on top of the.. what.. 22k(?) Haste we need to reach the Haste cap.