IMovie distorting (overdriving) my mastered audio track

I've mastered an audio track, peaking at -0.2 dB and sounding good, with zero digital or analog clipping. When I Import this track into iMovie the loudest parts of the track become distorted, sounding over-driven.
I've deselected the Normalize Audio option, and tried dragging overall track volume down, but still there are parts of the audio sounding like I haven't got a clue how to master a song.
Is this a bug in iMovie, or is there a maximum loudness of audio track that it will tolerate, (say peaking at -1 dB for example)?
Thanks for any help.

It's been a long day.....somehow I accidentally turned my ducking to zero also, then when I applied my audio settings to all clips, obviously it also applied my ducking mistake. Just not my day!

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