Besides... if you have a large group and you are shooting outside in the shade... you really don't want to close up your Aperture too much. You can shoot f/5.6 and as mentioned - learn your field of depth.
Here is a group shot of many more than 11: Settings are:
Camera: Nikon D80
Exposure: 0.008 sec (1/125)
Aperture: f/5.6
Focal Length: 60 mm
Exposure: 0.00
ISO Speed: 160
Exposure Bias: 0 EV
Flash: No Flash
I had moved back farther but as you can see the clarity is not too bad.