Tweak your Peaks
Here are some things I use about getting gain.
When using the master fader, try to find out which tracks are causing your peaks to go high. This might be some particular hard swells or hard snare hits. Go to those tracks and try to attenuate those peaks. Like say you have 3 snare hits that are too loud. Use the audiosuite plug called gain, and reduce those peak waveforms a couple of db. For discrete problem areas, I find that the gain plug works well.
If you tweak the peaks of the tracks that are causing your master fader to clip, you will find that you can run the master fader gain up and therefore get a higher mixed volume level.
You may also need to back off of tracks that are causing the overall levels to run high. Can you live with the drums being just a little bit lower in the mix, or the bass, etc. Backing off some overall track levels will give you more headroom with your master fader, and again, more mixed volume.
Also, take a close look at stereo clipping. Is one side clipping before the other ? You may need to adjust some panning issues to help reduce one side that is clipping. Again, making adjustments for this, you will find that you have more master fader gain.
