Don't worry too much, just enjoy!
I think the ROM with the best battery life would be either Oxygen or MIUI, but probably oxygen. You should try it, it's very stable, clean gingerbread, and it looks gorgeous with the ICS theme.
On the other hand, I'm getting a pretty good battery life with 9.7 Elite (from 8, 9h until 22, 23h, with moderate usage (a few sms's, moderate wifi usage, music) I still have around 30, 40% left). Using wifi, gps, 3G, etc. only when necessary might help, as well as using the app killer every once in a while (so you don't have a bunch of stuff running in the background and draining your battery), using automatic brightness...oh and about governor and scheduler I personally use smartassV2 and deadline (respectively), and my battery lifetime is the described above.
Also, try not to worry too much about battery drains, lower benchmark scores...I'm saying it because I did that when I bought the device...as long as it lasts the whole day and does what you want it to do, just enjoy your phone