Now there is an open-minded approach to evaluation.
Is is possible your difference is real? Sure. Actual evidence would show that- anecdote is no better than the person who swears that Ricky Jay was dealing off the top of the deck. Evidence like controlled listening tests, measurement differences above reasonable audible levels, measurements of stability (a BIG issue in hobbyist op-amp swapping).
Is it far more likely that your brain is lying to you? Absolutely. In science, we start with the most likely hypotheses and work from there. You haven't addressed that.
Do you agree that two amps or two dac sound different even when the thd imd noise multitone are reasonably low?
There was a guy in this forum the other day swear v200 has more body than thx789. And he really wants it on thx789. There is no way that he biased on v200. And from what i learned, it's the power supply noise creeping in the sound(not directly audible but will affect the sound) And the power supply noise is under -110dbu. Also the distortion is less than 0.001% under any load over 16 ohm. And can go down to 0.0001% for higher impedance load. I also hear difference between burson cv2+, v200, o2, jds el amp, db magix ac3 and musiland mu2p.
Also once on the show, i paired three amps with final d8000 prototype. Wa33, 430had, burson cv2+ also sp1000(isn't really an amp). Wa33 sounds like shit, 430had is much better but still plasticy sound and a bit sharp, with burson it's sounds very smooth and controled. I later on measured cv2, distortion is flat 0.002% across the frequency range. And i used hifiman he560 on burson, musiland 06p and phone output. Burson sounds colored but no 4khz issue. 06p emphasis the 4k issue sounds dry and grainy. Phone sounds soft but not too bad sounding.
I can go on and on. Opamps do make a lot less different themselves than circuits/amp/dac. But if one say he hear no difference between good measured amps and dacs? That guy must be deaf.