Hi naturlaut,
Thanks for your very nice comments. Yes, I think even as early as Op. 12, Catoire was coming into his own idiom or voice. I've run into one listener who considers Catoire to be urbane, sincere, and a fine craftsman, but whose music is not memorable. I very much disagree with that assessment. I'm also glad to say that everyone else has been quite taken by these compositions. And I'm very pleased to be making a small contribution in making this wonderful music better known on these piano websites.
Yes, you're entirely correct. The term I was searching for is indeed the "flow" of the music. At the tempo I selected for my interpretation, the flow seems ideal for shaping the phrasing, rubato, and nuances--at least to me. This music, like that of Faure, is difficult to characterize exactly. Some say they hear it as romantic, others as impressionistic, and still others as mysterious. To that, I would add that it often strikes me as expressionistic too. Maybe it has all of those qualities. These pieces, in my opinion, cannot be rushed. They need to unfold in their splendor, and the listener needs to be able to savor and luxuriate in this "new music".