Its good that u are getting such great battery life with ur setup ( the recent stock ROMS let alone debloated , deodexed ones are really snappier and faster i believe )
But then if you are happy, who are we.
But i would like to know how your fascinate will fare with above normal usage , i mean regular internet use , browsing , downloading , gaming and all, live wallpaers more frequent app syncing coz as far as my knowledge goes DL30 was actually leaked froyo , and it seemed resonably stable at the time.
The measures that you have taken will help no doubt on any setup ( but yes charging while off after calibrating the battery is good indeed )
I use my handset a lot i mean really i love my fascinate and just cant leave it idle for a min when i am free so from my perspective i feel these things are also beneficial :
The biggest advantage in terms of backup comes ( irrespective of any ROM )
from having a undervolt kernal ( -50 works the best and is safest otherwise -100 and SV are also there)
the best radio ( which are till date EA28 and Ed04 - Ed04 is awesome as it kicks the evdo speed way too much side by side making 2 to 3 bars of signal out of 1 ) - this can be confirmed by looking into battery use by cell standby and seeing how much time ur cell has been without signal
rest as you urself said wifi , least apps , least data transfer and stuff.
and wiping the battery stats usually settles the calibration of the battery right,
if you are rooted and are with CWM then just by charging 100% while on , then charging 100% while off and then again charging 100% when on > after that rebooting in recovery and deleting battery stats will set the calibration of any battery right, it is particularly beneficial if you are fond of flashing new ROMs and trying out new combinations every now and then.
just my 2 cents in additions to ur findings
As always Regards to you for being a very aware and helping member at this awesome forum
ALSO a very very important thing , and this goes to all of you fascinate users
Are you guyz also noticing that while in deep sleep ( i mean when the screen is in sleep mode and locked ) the phone doesn't receive calls as well as texts on a number of occasions , whosoever is calling you says the phone was ringing , but there is no9 display of ringing at ur end ??