The thing about green photons having too much energy isn't really true, though it's commonly talked about. Blue photons are significantly higher-energy than green, and are very well-absorbed. There's speculation that our sun (being a greenish star) just produces too many green photons, and absorbing so many so fast would be detrimental, but I haven't seen that definitively proven yet. People are trying, though -- there are all sorts of papers about making artificial supplementary antennae to absorb in the green region.

There are a couple proposed reasons to reflect green, which range from information theory arguments about decoupling different parts of the photosynthetic mechanism, to the 'purple earth' hypothesis mentioned in another comment, to the 'green sun' idea. My point is, the why of green photosynthesis is not a settled matter.

Also, the absorbance of red and blue photons isn't because red and blue photons have useful energies, specifically. The photons excite electrons in a 'high energy' path and a 'low energy' path, yes, but the elections excited by these photons don't directly do chemical work -- these exitons are in a quantum-coupled system which is very complicated to understand (I won't even pretend I understand it fully), and the reduction potentials further down the line are only indirectly (and not proportionally) connected to the energies of the original photons.

Basically, we have studied photosynthesis really intensively for like 50+ years, and in some ways it's still basically magic. The more we study it, the more information we have, but more often than not that leaves us more confused, because it's just a crazy system. And I, for one, think that's pretty damn cool.

Will edit later with sources.