Blinds do make sense...and change out those Can Flood lamps to "Spot" lamps, plus put 'em on a Dimmer iffin' they ain't on one already.
dim your LEDs..you should.do so to the point that you have a subtle "Glow" around the screen, not a bright Halo. That degree of obvious gross reflection of light off the Ceiling/Wall juncture would be /is a terrible handicap to any screen design.
There are reasonable limits to everything, and proper ways to use / present them. A failure to exercise such Front Projection-oriented jurisprudence can mislead others into wrongful conclusions.
If you want to pump out that much brightness, or anything remotely akin to such, you'll need to make a concerted effort to "Black Out" at least 24" of the ceiling above the screen.
Take note of how intensely the light is reflected off the ceiling directly above the screen. It's so intense that there is almost no difference in fl
reflection off the ceiling / upper screen wall juncture and the originating LED lights. In fact, both appear almost identical. Only the sidewall, being further removed shows a lessor effect.
Just pointing out that with great Back-lighting come great responsibility. Used wisely it's a great effect. Used incorrectly and it becomes a detrimental thing.