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Here is the theorycraft (maybe be flawed and would welcome feedback)
1)Energy wasted; given 42 energy cost for shred, you are often left with anything between 0-8 energy when you decide to shift out. It's acutally rare to get zero energy exactly and so lets assume an average of 3, given that most would not powershift on 8, and the mean of the other 4 is 3.
2)So timeline assumption (optimal powershifting, i.e. you shift purely for energy and you have superhuman robotic reactions allowing you to lose no time between punchign keys!;
time=0.0sec ; GCD triggered after last move.
time=0.0sec ; shift out (you can shift out during gcd?)
time=1.5sec ; shift back in
time=2.5sec ; your first white hit goes in. (is this correct?)
time=3.0sec ; your first yellow hit goes in.
3)Lost dps due to powershifting is 2.5 sec of white dmg
4)Energy gained is 40*(4secs-1.5sec)=25
less expected OoC = 2.5*42energy*OoC proc % (i dont know this)
WOuld be grateful for contributions and clarifications on the above.
But straight away, you CANNOT lose 2.5 secs fo white dmg given that that is more than mangle. PLus the ignored mana costs (druids often contribute by healign themselves and ressing so mana cost is not zero) and I conclude that you should NEVER powershift.
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