samba - CIFS Mounting Permissions

I have an issue that I;m going round in circles with, I hope you can help.

The Set up:

Server 1 (CIFS Client) - CentOS 6.3 AD integrated uing Samba/Winbind & idmap_ad

Server 2 (CIFS Server) - CentOS 6.3 AD integrated uing Samba/Winbind & idmap_ad

All users (apart from root) are AD authenticated and this, including groups, etc works happily.

What's working:

I have created a share on Server 2:

[share2]
   path = /srv/samba/share2

   writeable = yes

Permissions on the share:

drwxrwx---. 2 root domain users 4096 Oct 12 09:21 share2

I can log into a Windows machine as user5 (member of domain users) and everything works as it should, for example: If I create a file it shows the correct permissions and attributes on both the MS and the Linux sides.

Where I Fall Down:

I mount the share on Server 1 using:

# mount //server2/share2 /mnt/share2/ -o username=cifsmount,password=blah,domain=blah

Or using fstab:

//server2/share2     /mnt/share2            cifs    credentials=/blah/.creds        0 0

This mounts fine, but....

If I su, or log onto server 1 as a normal user (say user5) and try to create a file I get:

#touch test
touch test
touch: cannot touch `test': Permission denied

Then if I check the folder the file was created but as the cifsmount user:

-rw-r--r--. 1 cifsmount domain users    0 Oct 12 09:21 test

I can rename, delete, move or copy stuff around as user5, I just can't create anything, what am I doing wrong?

I'm guessing it's something to do with the mount action as when I log onto server2 as user5 and access the folder locally it all works as it should.

Can anyone point me in the right direction?