What 11x14 camera do you have and what does it weight? This will have a tremendous effect on any recommendations and combinations that can be used.

My Wisner 11x14 is a tech field and needs the Ries A250 and the heavy A100 legs. It has a 6" round head and the camera sits proudly and safely on these legs. My Deardorff V11 is similarly positioned.

You want to make sure that you use the correct tool for the job.

Cheers!