Years ago I attended a workshop given by Larry Jordan when I was still working with FCP7 – he suggested normalizing music in a video timeline to -4.5 db, so usually when about to work with a new track I’ll bring it in to Audition first, normalize it, and convert sample rates there, then import into Premiere.
When you say “crushed” at the top, are we talking about flat peaks that look like they’ve been run through a hard limiter, or sound that was clipped and run through a declipper filter?