bman, I think when your TV wasn't wall-mounted, it interfered with the "early reflections" curve that Axiom designed to. This curve is responsible for image width, stability and timber. The curve is taken from 40 degrees to 80 degrees across (also 50 degrees up and down but that's not relevant here).
I've always wondered though what level of engineering goes into the on-walls and in-walls. How is the family of curves adjusted for these models? Are new curves taken? If so, how do they account for the wall?
Likely Axiom will remain guarded around these questions. Although the science and characterization methodology around the parametric curves are well-established, there are nuances to testing and interpretation, as well as extension to non-traditional speaker designs, that are company secrets.
Anyway, you have a great system there and it will bring you all a lot of enjoyment. We are extremely fortunate to be part of a minority on this planet who can enjoy high fidelity so we should be very grateful.
Wow, a lot of science behind this. All I know about the in-walls is that bringing the drivers just that tiny bit forward of the wall plane dramatically improves their sound. Many lesser in-walls fail to consider this in their design.