[Galaxy Note II Original Android Development] magnamentis:
there is a bit of a history haha... :)

depending on rom and nightly of sometimes the same rom things can change quite a bit. i had the issue with omni about 3 months ago and it went away and later came back and so forth. exactly the same with cm, previously unofficial, now official, same story, problem is there, goes away and comes back a number of nightlies later. so i understand that wifi off is not an option if you're using bluetooth at home, on the other hand battery should not be a problem then because where one usually uses bluetooth speaker there is powersupply, thus my recommendation with per app changing governor would be possible without draining you battery further while on battery. just choose the criteria carefully, for example in tasker you can choose a condition that bluetooth is connected to a specific device (speakers) and only then would change to ondemand or performance!

however first thing to to would be to increase readahead buffer size because that's anyway a good thing in my opionion, doing it since i can think and know that this tweak exists. further go to settings > bluetooth > choose your devices settings and uncheck phone audio. this is currently what does the job on CM11 for me while the others didn't work, but worked many months till 11th april nightly WTF, annoying but without bluetooth on the motorbike i would have to throw the device aways thus it's essential, basically this is why some reactions like: "which issue" drives me crazy in times of handfree calling mandatory in most countries in europe if not all, bluetooth is a keyfeature, almost second to phoning itself :) further i have read about this problem in this very thread various time, including my own post many months ago, so how can one ask "which issue" it's well known around the community.

however, if you cannot switch off wifi completetly, you did not say if you're on wife 5Ghz or 2.4Ghz. it's only the 5Ghz which causes issues

with bluetooth so you could go from automatic to 2.4Ghz only if you're not on 5Ghz like myself for good reason.

next, custom kernels usually help but for this device it's a bit of PITA there are only few left for kitkat and they impact the boot.img and the format of the sdcard in parts so heavily, that one cannot flash anything without using that kernel anymore. i think there will be a few surprised guys in the future when they want to change kernel or install their or another rom without the custom kernel for whatever reason.

your issue with the battery i do not understand, i have trippled my battery life in idle and x1.5 in use since switching to kitkat. currently my device is consuming only 0.1-0.5% per hour in idle mode while to compare SOT is another PITA since every usage is different.

hope that helps and please if you find this or my other post helpful don't forget the little button to show that. it's basically the only thing which we should all do to get a valuable free exchange of information

good luck and happy easter

Current Devices:

I9100, PAC-ROM 4.3.1 ( Formerly Omni, PA, Dorimanx, etc. )

N7000, 4.1.2 TouchWizz All Stock ( very motivating to continue flashing custom roms further haha.... )

N7100, Cyanogenmod 11, AGNI Kernel 2.7.5_r3, Xposed Framework ( Formerly AOSNP, PAC, Omni, PA, Devil, Thor, etc. )

Nexus 4, Cataclysm 4.4.2, Franco Kernel r203, Dalvik & Bionic Patched, Xposed Framework ( Formerly PAC, PA, Cataclysm, Faux, etc. )

Nexus 5, Cyanogenmod 11, ElementalX Kernel 0.34, Xposed, ( Formerly Cataclysm, Franco & FKU Color Control, Dalvik & Bionic, Faux, Bricked, etc. )