The wandering zero manifests itself most distinctly on cold bore shots, or after significant movement to a new shooting position.
It seems to take a couple rounds to settle in, the only people I know using them successfully have glued their actions in.
The inline bore thing didn't make any difference at all to me vs other chassis. And most good chassis will allow the buttpad to be adjusted vertically to give an inline profile.
Brian, try something different, although the cadex's are nice, I would not say they are the best chassis. I prefer the 2014+ ax, based on the mag well profile, grip shape, forearm shape and weight, and bedding type.
You're going to short change yourself if you're looking strictly for a chassis that recycles your ar furniture. Pretty much any chassis that uses ar stuff is going to be a compromise ie. - trigger position and bolt access on the hs3.