The recomended one (in my opinion) is to use the --best option:
upx --best "filename"
If you are desperate, another option (tooks AGES

upx --brute "filename"
or
upx --ultrabrute "filename"
Ultrabrute is quite useless because it tries to compress the exe in 72 different ways

You can get the full help with:
upx --help
Bye bye!!!
BTW: with --brute on your new release, I got a 58 kb (another classical target, so I think could be compressed: to 55,4 kb in a zip file)
Remember that lower size is _always_ more impressive
