I don't know if anybody has noticed yet, after I finished my mix, I tried it out on a couple of systems, the main thing I noticed was the translation and the fact it doesn't distort on my phone, so in the Day 3 training session @Caleb Loveless said.......Secret tip. Be at -15 RMS after EQ. -12 RMS after compression, -9 RMS after limiting. And thus it turns out, these do appear to be the magic numbers.....