In low power mode, the SoC or System on a Chip stays active in case you want the screen or need to ask a question, like a phone does..
I thought when the lid is closed, it does what you have it set to do and does not turn on the screen. There have be many folks complaining about a system turning on the screen even when inside a case so watch for that. Bluetooth devices, such as a mouse or Pen can turn on the screen and make the system active.
Putting the system into Hibernation, stops any more battery drain as long as it stays in hibernation. You have one of the earliest versions of the system so it may not be as capable as later systems concerning these type of operations..
As far as the report, the top section has a table of all the sessions. You can go directly to one by clicking on that line. From there you can expand out the listing to see if you can tell what is draining power. Your goal would be to limit the drain as much as possible but you won't be able to stop it completely.
There should also be a setting on the Power and Sleep page regarding staying connected during standby periods. It is supposed to allow the system to send and receive Wi-Fi traffic. My system never really seemed to work correctly doing such operations.
You should be able to find information online if you search for Modern Standby or Connected Standby and maybe even InstantGo..