i just personally think that sub takes up to much of the mix. If your listening at home then plenty of sub is wicked but when ure mixing its not so good. ive got a few tunes that have loads of sub which sound wicked but when your mixing they drop down when you bring them in. For me the label rythymn convert has some of the best sounding tunes (in terms of mastering) out there and when i recorded one of there tunes there was no frequencies under 60hz in it. I do agree with what ure saying about the mid in my tune though had a listen to it on my headphones and they kick is very mid range