[Samba] Windows file directory creation permission confusion

[Markb]

Samba 4
Simple Samba file share, Domain Controller
Users - windows 7

I am having problems getting folder and file permissions to working 
properly from the Windows clients.  No setting I change in smb.conf have 
any effect on files and folders created from windows clients.  (I see 
this kind of question a lot other places so you must be tired of it.)

Smb.conf
[GLOBAL]
force create mode = 0770
force directory mode = 0770
create mask = 0660

I don't have any create/mask statements in the share as they do not seem 
to make a difference.
I am using a single large file share with sticky gid bit set (2774)

Goal: files created should have user as owner and sambashare as group 
with 774 permissions.

Folders are created with 2777 and set GID
Files created with 0766

When I started working on this folders were getting created with 2740. 
On the server I chmod g+rw on the share and now folders are created with 
2777.  (this doesn't make sense to me)

With every config change I reload the config file with (Ubuntu 16.04 lts):
sudo /etc/init.d/samba reload

--
mark B