For 4v4, the change doesn't actually disturb me a lot.
The first 30 seconds is when i cast all my big stuff. Before i didn't even need my Power Drain at all, i was just happy when i got one off. Now i'll just need to be more careful about its use and concentrate on that when cooldown is ready (not that hard really).
They also nerfed Hex Breaker a lot : a lot less wasted hex, thus energy. I really don't worry too much about energy management in PvE. I -might- switch Faint with SoF/Shackles so i'll have a little higher energy and a little higher inspiration too (no need for curses...).
I understand your problem with PvE tough! Seems like it will be MUCH harder to keep things up there. SoF seems like a good option if you can have anything going with it.
You considered going for Me/E? Drop Soothing and use Ward vs Melee or Blurr Vision. Use SoF on the melee guys (or targets in Blurr, w/e. I prefer Ward vs Melee overall but Blurr is nice if you go in places with more rangers and less warriors). They'll miss a lot and provide you with endless energy to keep your MoP up. Seems like a potent option to me.