We know exactly what causes the top view flickering and THAT one can't be solved.
The flickering while approaching in normal VC doesn't happen, not as described.
Even if it "looks" similar (all z-fighting looks similar), it's not the same issue but, while we know about the top-down view flickering and can replicate it easily (it's just there and will not go away), I can't see ANY flickering when approaching from normal glide path angles or, in any case, no flicker stays until just before touch down, as described.
Yes, we can tweak the scenery to lessen the problem but, the very fact we ARE seeing different things (and of course, everybody would reported it just the same) should be proof enough the problem is not just the scenery, but might become worse when something else is installed.
It MIGHT be video-card related too, because z-fighting is related to z-buffer precision and bit depth so, for example, some tweaks related to z-buffer setting might improve/worse the situation.