I would suspect the inode64 option is the problem
We had similar issues running 32 bit apps on a 64 bit clients accessing 'large' NFS servers (non-Linux NFS servers) - the 'fix' was to make sure the file systems were exported/mounted with 32 bit inode compatibility
http://xfs.org/index.php/XFS_FAQ#Q:_Why_doesn.27t_NFS-exporting_subdirectori...
Link colour in my browser indicates I've looked at this before. D'oh.
The fsid option seems to work, but I need more testing.