In the flyout menu for the timeline, you can uncheck Rectified Audio Waveforms to return them to normal. (I do wish Adobe had not set this as default. It's just odd.)
But for resyncing, you can only do this in the sequence.
I have my waveforms back! Thank you SO MUCH! I looked everywhere and just couldn't find a setting for this.
As for the sync, I guess that's OK - it's no worse than what I had before (and with the waveforms back, less of an issue to do manually). Would be nice if they'd add the ability to offset the audio track in the Modify Clip screen at some point (and it would open up the multi-cam sync feature to more users), but I can cope without for now.
Thanks again for your help.