Cause the adobe reader is probably not the smallest, we also considered to use an lightweight alternativ like sumatrapdf or foxitreader. This would be a great point to start using one of those alternatives.
/wait halts execution of batch job until Adobe Reader terminated itself. And option /min results in executing the GUI application with a minimized window if the application does not override it and displays nevertheless the window maximized or in restored mode.
I'm not sure if SumatraPDF Manual is up-to-date because it links at bottom to a Wiki documentation for Sumatra PDF with Command Line Arguments page. This Wiki page was recently updated and contains different information regarding to printing options.
Looking on your code for the FOR loop there is something wrong as you specify the space character as delimiter which is not good for file paths/names with a space inside. Also the space character is by default a delimiter for command FOR and therefore it is not necessary to explicit define it as delimiter if that is really wanted.
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