Xperia Ray :: Super Fast Battery Consumption (nearly 8% Per Hr) When Idle/standby?

The above screenshots reveal that my phone is rapidly losing battery at a rate of 7.3% per hour. This value is sometimes up to 8% per hour. The split is typically as shown in the first screenshot - "cell standby" and "phone idle" account for circa 50% of the loss.what I get with what I consider to be standby/idle (so not even "normal use") and with best (?) battery saving settings:
WIFI - offGPS - offData - offRoaming - offDisplay Brightness - 0Power save mode - onJuice defender - installed and set to advancedThe only app I have installed apart from the usual "bloatware" is avast (as I prefer this over the pre-installed Mcafee)I also have GPU rendering forced to 2DI have max one background process runningWindow & transition animations - offAndroid version: 4.0.3Baseband version: 8x55A-AAABQOAZM-203028G-70Kernel version: 2.632.9-PERFBuild number: 4.1.A.0.562I have made only a single 2 minute call today, No SMS, No MMS and not used the internet nor played any games.The apps/processes running are shown on the above screenshots. Although I updated my phone using PC Companion to 4.0.3 (ICS), this has made no noticeable difference to battery life as I had the problem already before this. In fact I had hoped it might fix the problem! Apps such avast and juice defender also made no difference (good or bad) to battery life - the output I get from the screenshots are nearly always the same - 7 to 8% battery loss per hour.

I've tried battery recalibration (which I understand is achieved by using phone to 0%, taking out battery for 15 mins, replacing it and charging to 100% whilst off, then starting up phone). Again, nothing.I don't think I can get even "normal use" of 12 or so hours and the phone is most certainly NOT meeting the specified values:Talk time (up to): 7 hoursStandby time (up to): 440 hoursMusic listening time: 36 hours The above would be a dream! (I mean, standby 440 hours? That represents 440/24 = 18 days!