Lost 30% in 10 hours while suspended: how does this compare?

You could try my script to disable devices: [Guide] Automatically disable USB devices for battery savings

and then use systemd to automatically run it before & after suspend. See Running scripts before and after suspend with systemd – Just another Linux geek for details.

e.g. something like this:

#! /bin/sh
if [ "${1}" == "pre" ]; then
  command=off
else
  command=on
fi
turn_usb --vendor-id=FOO --product-id=BAR $command
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