I've been trying to create an example to illustrate why combining flare and the film curve can be misleading. Flare increases the exposure coming from the subject. The x-axis is concerned with log exposure (log-H). Increasing exposure moves the placement to the right. Flare simply moves the shadow exposure to the right where it falls slightly higher on the curve.
What a flare-film curve combination does is project the density from the point where the flare exposure falls to the non-flare subject position. In the example, the exposure from flare is shown using the three colored vertical lines. Everything to the left of those lines actually received no exposure.
Henry Flare Curve .jpg