12many OP
Some bass great, other bass bad: It’s your space then, certain bass frequencies (or their overtones), not all, are causing problems, becoming stronger/weaker/mud by the mix of reflections of those/some specific frequencies.
I would try different positions and different toe-in, I just posted this about that:
"Thanks all. Good info. My issue is not so much about a poor quality recording, just that some good recordings are coming across with a bit too much bass energy, while other sound good, even when they have bass content. It may be the room or speaker positions or me - maybe I am not accepting enough of the artists/mixers choice to have more bass in some parts of the song. I don’t have subs in my system, but did have this issue before when using subs."