@fast
First, congratulations on your Kef Reference 5 speakers.
Second, trust the process you went through, as evident from your other thread. You took your time to research, ask for advice, listen and evaluate before finalizing a choice and purchasing them.
Third, continue to be patient, as you have been. Break in does take time and since you have tubed components (ARC) you are likely not running the speakers continuously.
Fourth, as you know, good/great relationships take work and effort. And importantly, that effort does and will pay off. I’m assuming here, but I’m sure it took some time to dial in your system to satisfaction when you brought your Proac speakers into it.
Fifth, give yourself (your ears) and your system credit and kudos for being able to easily differentiate between better and poorer recording quality.
Looking forward to your ongoing reports on your very personal journey. All the best.