So, I dropped the light cycle to 4 hours a day for a few days and started seeing drastic algae die off - the algae on the back glass started dying off in circles (kinda cool!). Then I raised the light from being on its legs on top of the tank, 2" from the water surface, to being 6" above, and upped the photo period to 8 hours.
The tank seems to have slowly started to recover over a couple days, but still, any new growth on rotala sp. green and some other fine leaved plans gets covered in algae. The plants grow fast, but so does the algae on their leaves. So yesterday I reduced the photo period to 6 hours.
Then, my struggling hygro leaves get eaten by the juvenile Angels (I figured it out as I carefully watched them picking at it and other plants, argh!).
So, needless to say, I'm not a very happy camper right now. I'm considering raising the light another inch or so, but I'll stay patient and stop changing things for a little while to get to some kind of a steady state.