Help Mobile Network Battery Drain

[dadadududo]

Hi I'm a newbie in this forum so please be nice
anyways
I've been using my Incredible S since it came out in Taiwan (about 2 years ago)
and it has always been good, lasting about 3 days before I need a charge (and that's still 20+%)
that's mainly because I usually NEVER TOUCH THE PHONE
But NOW, my phone is draining like crazy, about 55% every night, even though the Mobile Network Signal is yellow all that time
seriously
I see people out there with this same thread title
and then they figure out the problem is because they left 3G on or something
but for me, I

1. Do not have internet connection
2. Only turn Wifi on about once a day for less than 10 min
3. Turned off sync for Facebook AND Google
4. Have tried JuiceDefender & is using Advanced Task Killer
5. Only calls about twice a week
6. Plays about once a day for less than 20 min

I only have a few apps, and disabled many of the manufacturer's
The "Running Apps" page has so little apps I can't even scroll down

***And when I turn on Airplane Mode, my phone only uses about 3% every 6~8 hours
which is why I think the problem is the mobile network signal
so I'm hoping someone can answer my question
This problem started when I rooted and installed CM10.1, but now I'm back to stock rom, and the issue is still there
PLEASE HELP!!!

and thanks


P.S.
in the picture
the 1st line is Mobile Network Signal
2nd is Awake
3rd is Screen On
4th is Charging
the sudden end of the drop on the graph is when I turned on Airplane Mode, and the Mobile Network Signal disconnected