I actually restored my stock backup this morning. There's theories that it's caused by restoring apps/settings with TiBU.
It's suggested that after flashing you let your device relax for about 20 minutes untouched, than redownload your apps (not recover them).
Seems like this drain is reflected on my backup, it's steadily draining. Than again I played with my phone quite a bit this morning. I might just Odin (again) to clean stock rooted (again).
Sent from my rooted/modded/stock Samsung Galaxy S3 using Android Central Forums
I saw the same thread
The people at XDA are really unpleasant, it's a shame they have more info over there
I did exactly as you said, re-wiped, re-flashed, but instead of using Tibu, I used the app2zip recommendation over at XDA and it seems to have done the trick!
Battery life is better than my original flash of Synergy (although my battery wasn't quite as bad as what others were reporting in the thread)