For me the elements that are further at left/right are from behind the speaker plane, so not feeling like it’s emanating from the speakers themselves.
I’ve got my floorstanding speakers 2.6 meters from the wall behind them, with a little over a metre between speaker and side walls.
My speakers are not symmetrically placed! The left speaker is 8cm further into the room than the right, and is also not toed in a much, 4° vs 8°. When they were identical the stage was weighted to the right (2dB on the Pass Labs balance control centred it) and sounds were a little locked to the speakers.
The addition of a subwoofer got images more watched as well.
However, the specific problem of only high frequency things sticking to the speakers (hi-hats, upper harmonics of flute and electric guitar) was actually solved by the steps I took to reduce RFI/EMI in my system. A CommonGround power cable and various accessories from Akiko Audio. Indeed, if I simply remove those things from my system the depth of stage reduces and things start appearing from the speakers again.
Addressing electrical noise and RFI/EMI was huge fir me.
This is my set up (except there is not a steering wheel typically there)
The speakers are around 7-8Ft apart, and I am unfortunately up against the back wall which is around 8-9 ft from each speaker. I have a large open space behind the right loudspeaker and nothing behind the left one. I also have an open entry to the left without too much reflection due to this.