well, it got nerfed, the time shadow form is active is less but the recharge also is less.
its really hard because the normal 30~40 secs of less recharge, due to the use of glyph os swiftness and deadly paradox, is different, because the recharge is less, and so is the recharge taken from those spells.
but do not worry either. if you have those skills, wep with a 20% enchant mod and 16 shadow arts, you are still able to maintain it indefinitily, but you need to be really fast.
hope this doesnt affect the farming in a major way, though.