Reply to Basic questions - channel and EQ levels

I'm curious about some rules of thumb for mixer levels. I'm mainly interested in regards to recording DJ mixes at home, but feel free to chime in if it contrasts settings while playing out.

I use two CDJ900's and an older Rane MP22z mixer. I'm running through my computer's Line-In and recording with Audacity.

• What should my approach be to setting the levels properly? Should I set the channel faders to somewhere slightly less than 0db, and then adjust Audacity's master IN levels so they stay around -6 to -4 in Audacity?
  
  
• I find my recorded mixes to be a little muddy when compared to "professional" tracks. I keep my EQ's at 0, but do I need to compensate - perhaps because I'm using lower end gear ? Or is it best to leave EQ' at 0 and fix during post-production? I'm yet to explore mastering. For what it's worth, I export default settings to both WAV and MP3 and both are like this. Example below:

https://soundcloud.com/ever111/unpol...ctice-jam-tech