After clean flashing the 7.2 rom, open the camera once on stock kernel. Only after that you should flash custom kernel like yank, boeffla or agni.
Use better battery statistics to figure what is causing the drain. You could get help from Bbs thread once you get a lag. Do this after a couple of cycles and also after not using the phone for at least 4 hours
Xposed is awesome. Once you install it and reboot. Go to download section and check out all the modules. Wanam Xposed and gravity box(kk) are my favourites among others
Hope this helped
Sent from my GT-I9300 using Tapatalk
thank you so much for your quick reply and great suggestions i will do what you said regarding my battery thank you again
can i be more greedy and ask you for a flashable CWM to restore the boot menu ? because i used to get it from wanam xposed but since your rom is 4.4 and wanam only works in 4.3 and Agini for some reason doesn't seem to work i flashed PSN_AGNi_pureSTOCK-v4.2_R3_Ported-4.4.2_I9300_AROMA-signed when i press on reboot to recovery or only just reboot it doesn't do anything