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.