It would be helpful if you can post what solved your problem with some details.
Note: on turning off DirectorySlash -
# see security warning below!<Location"/some/path">DirectorySlashOffSetHandler some-handler </Location>
Turning off the trailing slash redirect may result in an information disclosure. Consider a situation where mod_autoindex is active (Options +Indexes) and DirectoryIndex is set to a valid resource (say, index.html) and there's no other special handler defined for that URL. In this case a request with a trailing slash would show the index.html file. But a request without trailing slash would list the directory contents.