Hi
@tonapo
I understand where you are coming from. I have been not too long ago in a similar boat. I was a subjective audiophile. I did preach, abide and defend the "everything-makes-a-difference" B.S. err ... mantra. I even believed in cables, DAC, Different electronics and expensive, very expensive loudspeakers. I was invited to ASR. it came to be a daily Internet destination, and I have never enjoyed so much music in 50 years of being an audiophile (started in my early teens...). Oh! and before I forget, my current system is the
Best I have had in those 50 years, as well as being the least expensive, and I would even go as far as saying the more mundane: it is anchored by an AVR, The subs are Dayton aka Parts Express, the speakers are the lowly and powered JBL LSR 30x series!! Before I had preamps that cost more than this entire system, amps that cost multiple of it. I'll add that I am familiar , yes, with systems costing well over U$500,000.oo.. Very familiar, most of these systems look impressive (Audio porn), but do not sound as good as the one I have now, I know, I know , tooting my own horn... I am satisfied to the point that I am very reluctant to change anything... so much I am enjoying music, mostly from the compressed variety (Spotify is my main source) and movies, yes, it serves both duties... admirably. My former HT front projector cost more than the entire current HT and music system... The only expensive item I have in the system is a Stewart GrayHawk 100 inches screen ... it was however purchased on eBay for 1/10 th its retail price .. thus ...
This post is not about me. ii is about the anxiety that you feel. Short answer: It is fed by the Audio Industry , mainly the HEA. They cannot survive, if they don't feed your anxiety. They can't , won't ever, tell you that for all practical purposes, electronics are solved... DAC for example, where a $9.95 model clears the threshold of hearing, IOW you or actually more than 99.9999999999999% of the world population

, cannot, if blinded and levels are matched, hear
any difference between that sub $10,oo DAC and those costing $500.oo or $5,000.oo or God forbid >=$100,000.oo... Not too far for amplifiers, where most are indistinguishable from each other ... all things being equal or ... They will not tell you that. The magazines would have a serious problem reviewing what essentially sound the same and the industry would not be able to sell you $350,000.oo amplifier with the same distortion profile as that of $350.oo (no typo, three hundred fifty dollars) Nobsound Tube amplifier on Amazon... As a matter of fact the $350,.oo Nobsound may have better performance...

.
You have a good system with superlative speakers. Physics say that most Audio systems require multiple subwoofers. Not an opinion, a fact. It is not a matter of bassheads, of explosion reproduction and Home theater. It is physics and biology/physiology/psycho acoustics. The most linear transducer, one that can reproduce, for example 1 Hz to 100 Khz with 0.0001% THD and able of 130 dB at 4 meters (Such doesn't exist by the way); placed in most any room, would give you a frequency response that could vary by more than 50 dB ( Yes, I said fifty dB) in the room. The room dominates in the bass... Entirely. Completely, and ineluctably. There is no escaping it. The solutions: EQ and DSP ... Thing is, Subs are made for bass (duh!) and it is easier to EQ them. Subs can be placed basically anywhere in the room, (I have one in the back of the room behind the couch on its side) and the judicious combination of their output and phase manipulation (there is a good software for that called MSO, Multiple Subwoofer Optimizer, a difficult to learn software but ... a marvel), can provide a level of sound reproduction when properly integrated with superior mains such as your Kef Reference, that you have no idea of... That most audiophiles have no idea of. Keep your system, In my honest opinion, your only path forward is to add two or more subwoofers to your system ... This is not easy. This is difficult but once done... I am repeating myself heaven... Perhaps DRC in which case cloud 109.. and a bit of room treatment too, not for the bass (forget about room treatment for the bass..., think about room treatments for first reflections, floor reflections, ceiling reflections, backwall reflections.
And you need to learn to measure. Rather inexpensive. A software (free) REW. $100 microphone, miniDSP Umik-1 and you are good to go... well prepared, to be good to go, you need to learn REW, learn how to measure. From there you will learn to integrate the subwoofers to your mains... Depending on how much you know or already knew this may take months... It took me almost 2 years... You must be prepared to research, toil, iterate, ask questions and be discouraged but you must forge ahead.. Stay on ASR, ask questions. People here
know, a lot more than on most audio sites. Prepare yourself to have your questions answered by luminaries, by honest amateurs with the knowledge of practiced professionals, by award-winning professionals and by enthusiasts, who know what the real deal is...
You will be glad you did.
Peace.