calculating Enchantress Focus Mind
Solution 1:
I have found the answer to my question,
Firstly Blizzard have screwed up, adding 3% to your AS is in fact to add 0.03 as a direct figure to your (Weapons AS * Weapon IAS) value, this returns me a figure that is now only .1 of a decimal out of the in game figure which is unfortunately acceptable.
Thus you need simply:
(Weapon AS * WeaponIAS) + 0.03.
Hate Blizz moment