There have been a couple of threads in the past where it turned out a long-forgotten print file was stuck in the print queue and was preventing sleep. Deleting the file seemed to fix it.
Also, try disconnecting any external drives, usb hubs, etc. (if you have any) to try to eliminate them as possible causes.
I have no printer and one HDD for Time Machine.
My pmset is :
$ pmset -g
AC Power -1*
Currently in use:
Thanks a lot
Oh well, it was worth a try. I was hoping the "sleep" line from the pmset would indicate a process keeping sleep off. But you have it set for 11 minutes and there is no process shown.
You might want to consider using PleaseSleep which attempts to force the system to obey your Energy Saver settings.