I'm very glad you enjoyed the Rameau! It is awesome, among the most expressive and difficult music for harpsichord. I very much recommend on that album Track 10, the gavotte and doubles which I think is Rameau's best. Not too chromatic though, but the progression featured in the second half is exactly this backwards circle of fifths I mentioned.
As for Lachrymae.... it may be my favorite piece of music from all times. At around 2:10 of your video, begins a progression whose roots move up by third. A progressive motion rather than regressive: so very non-tonal. So hearing such a novel progression combined with careful imitation makes that passage my favorite in all music
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