The db levels are informative to a point. What’s the ambient noise level of your room?
I don’t have to listen LOUD to get it, but if I crank it a bit more than mild, I’ll energize the room with the subs and can get more. It is not necessarily better, I listen to tonality, texture and a "filled in" dimensional sound- I usually start with the midrange anyway, if that isn’t grainless and transparent, I’m out. But in terms of volume level, depending on how loudly a particular level is cut into a specific pressing, there’s an ideal loudness level within a range. Beyond that, you aren’t going to get more. Is it a system failing? if so, I don’t care at this point.
Be happy, don’t worry. Or something.