It's easy enough to test IBNobody's numbers and theorycrafting. I'll do some consecutive Guardian runs where I do it my current way, and then do some more where I just don't cast FS at all. If I don't notice a *significant* difference in my power reserves and I don't need to drink any power pots, then IBNobody is right. I'll test and report back when I've been able to do about 4 runs for each trial.