to tell you the truth i dont take meters that seriously.
i have a referince of how loud the song should sound and i compare my song to other reference songs in the end at the same volume.
from my point of view is more important how much/many harmonics do you have.
and one secret trick that i have is i listen to the song/instrument on very low volume and if it sounds good there when i turn up the volume its ok almost every time.
if you manage to make a good mix than you can model it to sound in different shapes and give it the character you want (fat & warm/for radio/old/whatever..)
i general i look at the RMS