Where are you guys getting all these numbers????
The only time I know what my kick is hitting is when I first start a mix. And it's hitting anywhere from (scratching head to induce memory cells), -18 to -6 (dBFS) (I'm converting because it's analog at that point... I don't know what it is coming out of the DAW as I've never bothered to really pay much attention). That's a pretty wide swing. Why? BECAUSE IT DEPENDS on the song and the sound of the kick and everything else.
The bass, it depends. For those really subby basses, I keep 'em pretty quiet. How quiet? I don't know as I've never bothered to see what they are reading numbers wise, but I know those numbers are pretty low. More full range and trebley basses are louder because the physics of playback handles it better. How loud? Don't know. More dBFS's than the subby basses. But even still, same sub bass, different song, gonna be a way different level.
Anyway, OP: My advice is as follows. Stop worrying about the numbers so much because you can't mix by numbers. Not even close. Not even in the ballpark. Not even in the same zip code. Not even... you get the idea. Get some decent monitors (no need to go crazy) and TREAT THE ROOM with as much bass trapping as possible and absorption on all first reflection points. Then you'll be able to hear what's going on and you can start ignoring most of these numbers.