I am no expert but I looked into the systemd shutdown.target as well and found 
no parameters that can be changed.  I also performed a swap test where I loaded 
the swap partition to over 54% roughly 4.2 gig while my ram was at 87% full.  I 
have 3.7 gig ram available and 8.1 gig swap on my machine.  I loaded the system 
using Gimp opening and entire folder of photos, opening a browser and streaming 
a youtube movie. I then closed all applications and waited for 20 minutes with 
the monitor open. The swap file did lose half of its stored data to about 2 gig 
but then it seemed to pause at that point for a long time, longer than I was 
willing to wait.  I then ran:
sudo swapoff -a && systemctl poweroff

The swapoff process took another 10+ minutes and then the shutdown took
place without the hang.

It is my belief that the swap management app/function built into the OS
is the issue or at least part of it.

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https://bugs.launchpad.net/bugs/1464917

Title:
  reboot hangs at 'Reached target Shutdown'

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