Quote Originally Posted by Neophyter View Post
This site is where I got my info from. This one makes the most sense to me due to the increasing diminishing returns, but I never really tested this myself.
It's 40%, 60%, 80%.

That page is so wrong it's making me cry. Someone fix it, as I'm too lazy to create an account.

Quote Originally Posted by Niryco View Post
I have a thought, wouldn't fire IV under leylines be stronger than Thundercloud proc under leylines? So that means while leylines are up, would thunderproc be a dps lost?
Stronger in a sense that you can fit on more spells before your TC drops. A full TC is still almost 200 potency more per GCD than F4 and Ley also drops the "cast time" of your TC proc, so they stay roughly the same.