Sorry, wasn't try to keep any "secrets". Problem is, I saved the file in the wrong state and can't retrieve what I did, to show, but it was a very steep darkening curve and a very steep raise in the red channel (in Color mode. In Normal mode the raise would have been fighting with the darkening luminosity curve.).
Here's the state the file got mistakenly saved in. Red solid color layer in Multiply at 37% opacity, and a curve in normal mode as shown. Here I'm having trouble to get the highlights as white as I'd like, which is why I went to the two curves approach for greater control. Some might prefer this version, but that's why I like to try a variety of approaches.