Have you seen the type of construction it takes to contain serious bass? I think you'd need a completely different ceiling to contain it as your concrete walls/floors do, simply adding insulation or traps isn't going to do it.
Or you can go bass-averse like TLSGuy (likely mostly from content preference, altho he also seems to have house construction issues where serious bass starts to cause construction issues
), altho that wouldn't work for me nor you from what I've seen in your posting.