Like I have said my main concerns are that I have never had a PJ before where the convergence went out of whack just by inverting the image.
As I said before here, that aspect is normal—it's just the (I'd argue) non-intuitive way that JVC's pixel adjustments interact with installation styles: if you do pixel adjustments to improve convergence in one installation style, and then you just switch to the inverse style (e.g. tabletop front to ceiling front), the convergence will become "far off" (twice as bad as it would be with no pixel adjustments)—you have to invert all of the pixel adjustment values along with inverting the installation style.Far off when just inverting image, not projector, as I said earlier is strange.
I agree with others here who said that you should be concerned if you can't get acceptable results with your projector within the range of whole pixel adjustments.
FWIW, I've attached a snapshot of my RS1000's focus/convergence pattern with my normal settings (see first photo). That's with a whole pixel adjustment to red of H -1 and V -1 in Ceiling Front installation style. You can see a slight red fringe below the letter and the horizontal line, because the vertical whole pixel adjustment overshot by a little bit, but it's better than with it at zero—and that fringe is invisible to me at more than half a screen width away.
And to the earlier point, if I just switch from Ceiling Front to Front installation style and change nothing else, red will move completely off the horizontal and vertical lines—see the second snapshot attached, with the upside-down "Focus" text. To get that to look like the first snapshot I'd have to switch red to H +1 and V +1. That's just a choice JVC made in the design of this user experience, but not something to be concerned about with your projector.
Note that if you're using fine pixel adjustments, I'd expect that to cause a little bit of apparent softening of crisp pixel edges at least when viewed up close.
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