Sherm, try experimenting changing the settings of R6 and R7 in Mission Planner, I think Andru Lee was able to make progress in control action camera with the gimbal.
Nice hack / mod.
Yes, git2 updated to firmware 1.6 works (i.e. live view) using fixed mount and microHDMI. Just turn on "Image Rotation" in the settings. The video view is not upside down - normal one.