Does colour affect your mood?

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You have a good setup that covers the sound well and 4K (4,000 pixels per horizontal line) makes a huge difference to the picture resolution.

When you get some spare time, I would suggest a few experiments that will cost you nothing.

If possible, move the inner 2 speakers (that are producing 20 to 500 Hz) to the corners of the room, the best position to minimize LF harmonic distortion and interaction.
Point them towards the diagonally opposite corner of the room to increase the length of the standing wave. Do not worry, there is no stereo separation below 2,KHz .

Try the outer speakers lying on their back, raising them up a few inches if their are ports on the rear of the cabinet.
This will use the ceiling as a reflector and give a much fuller sound, avoiding unwanted distorted reverberation at the same time.
You may need to wind up the HF output on the amplifier feeding them, but the sound will be more natural and fill the whole room.

I am only suggesting this as a guide, just play around and you will be surprised.
The best test is to walk around the room and minimize any variations. Just a small twist or moving things a few inches can make a huge difference,

PS, Your brain has adjusted to what you are hearing now, so it will take a few days to adjust, even when you are making improvements.
The true test is what you hear within the first 30 seconds when you switch things on the following day.

PPS, It took more than 15 years to get things right at the Royal Albert Hall.

 

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Someone came up with that idea when I was refurbishing the Haymarket Odeon, I blew my top and said that it would look more like a fairground than a theater.

 

No and I agree with you. xxx