i took a look at the videos u posted above. to me it seems like a problem with this "anisotropic texture optimization"-feature. u'll find it in performance & quality settings. maybe turning it off will lead u to the result ur looking for.(maybe thats the "hq mode" ppl talkin bout here, i dunno) and i dunno, if this will solve this problem or not, cause im not playing this game, so i cant try it on my own. and i didnt recognize it in other games im playin, so its just a guess. but i think its worth a shot.
and to the other thing, i really didnt notice it while i watched the video for the first time. i had to look all over the entire screen, till i realized that "shimmering/flickerin" ur talkin bout. so maybe thats why ppl dont complain bout it, cause they just dunno that they could play it without it, they dont "see" it.