With this being even larger than the 49" and with the same poor viewing angles, could perhaps that be a reason for it having worse blooming? Assuming you have probably mounted the 57" where the 49" used to be and thus perhaps the difference in size could mean that viewing angles perhaps got worse relatively speaking. Most local dimming tend to be much worse when viewing from the sides compared to head on.I can defs say there is some blooming, more than my old Neo G9 unfortunately.
On my Neo G9 27", i could never notice blooming unless i viewed the screen on angle.
On this 57", i can see slightly some even straight on at the screen, but nothing major or too concerning to me.