[CentOS] Samba permissions problem

Hi all,
       I have a permissions problem with a samba share which I really 
can't fathom out. I'm trying to create a fully group writable share. 
Easy or so I thought.
As you can see from my config I am trying all the options to set files 
group writable, however when I create a file from the client I'm always 
getting the
mode 0644. Does anyone have a clue why?  Thanks!

client:
//database.pricetrak.com/spendtrak      /home/spendtrak cifs    
username=webserver,password=twonkerlet,uid=apache,file_mode=0660,dir_mode=0770  
0 0

server:
[spendtrak]
        comment = Spendtrak Files
        path = /home/spendtrak
        browseable = no
        writable = yes
        printable = no
        valid users = +spendtrak
        force group = spendtrak
        create mode = 0660
        create mask = 0660
        force create mode = 0660
        directory mode = 0770


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