Sorry for the slow reply, my night is pretty much your day currently.
I don't know the solution to the lighting and I am not technically minded enough to be able to have successfully worked it out yet. I can get saggitaria micro folia to grow but it stays short, short for even a dwarf sag. You could Plant it out with plants that are better in lower light for the bottom areas of your tank or you will eventually have to look at halogen or similar lights in the long run. However, my suggestion is to start off with what you understand, as you are, and build on it from there.