Hi Jonsac, I understand you have some different problems with noise. I also see it is an old post from you but maybe this will help. A while ago I was struggling with noise from old records, but there are so many filters inside Audition that it was hard to find which one first and what to be the next step. I finally found it ! 
I made a topic here about this , don’t worry the audio files you hear is in Dutch language, but the explanation is in English. The solution is nearly at the bottom of the page. If you need more information or when you have questions please do not hesitate to ask them.