Confounded by permissions problem on NFS share
Your noowners mention solved all of my issues. I would make sure all of your options are being applied w/ nfsstat -m -- mount_nfs likes to remove / add options and not list them when you just type mount I also am using launchctl configuration that runs a mount_nfs command, since automount was being unpredictable. I do see an s (setuid/setgid) up there in the permissions... I'm using nosuid...

Here's my working mount_nfs line, you probably can remove some of the options (some are duplicates), but I feel better having all the variations for some reason ;)

 mount_nfs -o "vers=3,noowners,nolocks,nolockd,nolock,nonlm,automounted,nosuid,hard,bg,noresvport,intr,rw,tcp,nfc"       &lt;server&gt;:/exports/myexport /Volumes/myexport


From ls -l from /Volumes:

drwxrwrwx  13 larry  staff   4.0K Jan 17 17:37 myexport


All folders within myexport are drwxrwrwx as well.

It's been an ongoing battle to get NFS and OSX working together but when it works it works flawlessly and fast.
AFP is on the way out, and Apple is sticking with Samba, which has always been a pain in my neck, whether the clients are OSX or Windows, there was always some sort of issue.