I just re-read and saw you went from 8" CA long-FL to 9.6" CA short-FL. The larger CA is going to give the edge. If the lamp has 1mm x 1mm luminous area with no emphasis in either dimension, the CP will be about the same with any reflector of the same CA, with the difference being in the beam pattern. You've really come up with a nicely optimized design.
By the way, positioning a lamp mounted with an elliptical reflector at the focal point of a parabolic reflector is not going to work. You'd have to position the focal point of the elliptical reflector at the focal point of the parabolic. For example, if the focal point of the elliptical is 4 inches from the lamp source, and the long-FL parabolic was 3", you'd have to position the lamp source 7" from the vertex of the parabolic. Same goes for when using an elliptical reflector with a lens. All that length is what makes elliptical designs comparatively on the large side.