I suggest that you should go back to E4d with a pit file, then upgrade to FP1 then FP5. This is the best clean install. My phone run as fast as my previous tweak 2.2, pbj kernel etc..but everything is working very smoothly. My signal bar wifi/4g are same as before, no improvement on voice. Auto brightness and battery saver options are working well. My battery is the best to date without any additional apps and using wifi only, I have tested phone sleep time (not using phone that much, only about 1hrs usage), I have 14hrs (1 hrs usage) with 73% leftover at the end of the day. I felt like I have JellyBeen on the charge. I only installed about a dozen absolutely needed apps like phone tracker security app, go launcher ex, ad blocker, root explorer, busybox, foxfi, mybackup,titanium,FBM9(facebook app, fring, appinstaller), super user, original weather widget, go launcher switch (to toggle wifi/4g,flash light, etc..) to start out with. My opinion, yes you should upgrade, but do it with a pit file.