Volume level control

As Steve_G says this is a job where your ears are the best judge.
I found that if I ever have to do this I generally put all the final mixes into a multitrack session and solo between each track while playing them all in order to get a 'feel' for the perceived volume of each track and making adjustments accordingly

In Audition 3 there is Edit>Group Waveform Analyse, but I don't personally think it's very effective. This is really something your ears should be telling you. The purpose of Normalize on its own as an effect is simply to make the highest peak in your file hit a fixed level, and as you have observed, this has nothing to do with how 'loud' something sounds. Later versions of Audition are better about sorting out relative loudness - the algorithms involved have improved significantly.