Well from the pics I wouldn't describe those particular examples at all as being an extreme angle but I do know what you mean by that.
Interesting point about the source of light affecting this though. I hadn't observed that, but you're absolutely right having just checked it in normal daylight.
Flaws are still visible in daylight vs light from my monitor/tungsten bulb etc, but not nearly as bad.
At the same time though, I can actually see flaws in it when viewing completely straight on to the screen, which I hadn't previously spotted.