When folders have been redirected with the “Grant user exclusive rights” option, the Admin user needs to take ownership and change the permissions to be able to access the files (to move the share for example).
Now, assuming you have a directory structure like: x:\docs_share\username, then just set the permissions you need on x:\docs_share, cd to x:\docs_share and run:
takeown /f <username> /a /r /d Y
icacls <username> /reset /t /q
icacls <username> /grant <username>:(OI)(CI)F /q
This will take ownership by the administrators group, reset all of the permissions on all of the files to tell them to inherit, then grants full access to the directory to the username, and tells it to inherit to all subfolders and files. You could probably get by with just granting (M)odify permissions to the users rather than (F)ull control.
It shouldn't be too hard to script this to run over several directories.