root partition full

[CJ Tres]

I've followed the guide at http://ubuntuforums.org/showthread.php?t=1122670

Unmounting all but system partitions,
I've run apt-get-clean and -autoclean along with --autoremove, emptied 
trash in root and home and after I removed old kernels and headers I've 
reduced / by 4%.
There are no large or numerous log files, although I did delete the 
oldest ones in each group.

I did install doodle yesterday, which created a 20G directory in /var/lib.
As an experiment I moved that folder to another hd but the size of / 
wasn't reduced, it's still 96% full! - 28G total 26G used 1.1G 
available. When I tried to put it back there wasn't enough room.
Remaining directories are at or < 1%.

Analyzing the file system with disk usage analyzer (gksudo boabab) still 
reports root as 100% full (after doing the above steps) and the size as 
13.5G, home as 62.3% full - 8.4G, /usr as 27.5% at 3.7G and /var - 4,5% 
- 617.1 MB.

  df -Th | sort says:
/dev/sda1     ext3     28G   26G  1.1G  96% /
/dev/sda7     ext4     51G   13G   36G  27% /home
Filesystem    Type    Size  Used Avail Use% Mounted on
none      devtmpfs    4.0G  704K  4.0G   1% /dev
none         tmpfs    4.0G     0  4.0G   0% /var/lock
none         tmpfs    4.0G  432K  4.0G   1% /var/run
none         tmpfs    4.0G  788K  4.0G   1% /dev/shm

Is there something else I'm missing that I may be able to do to get the 
percentage down or is my / partition just too small?