[Stuartambient]

Hopefully you can see the picture clear enough to show things are not perfectly level, for some reason.  Would being off by that much be a problem?  It is sitting on a flat surface with some double side tape underneath.  If I move the cc3d around a bit, just itself, I can be even on the horizon, so maybe I need to do a little shim on one side though it is not noticeably lopsided. 

What do you think? Thanks!

Edit: I notice in the LP screen the horizon lines bounces up and down slightly.  I may not understand this screen.

[f5soh]

You can redo the level calibration on Attitude tab.

The only reference is the flight test, you can adjust level if needed using the Virtual attitude rotation.

[Stuartambient]

-1 on Virtual roll seemed to get it centered.  Not sure what you mean by "The only reference is the flight test".  Gather you mean putting it up in the air ?