Well, a lot of the advice given we've already been following, with the exception of increased current.

-We change the water 10% every week (or, if we somehow forget, our plan is to chang 20% the next week).
-Our blue lights are on 12 hours a day, and the whites are on for 8.
-We feed about a quarter of the frozen food "pellets". We take them from the container, cut those into quarters, and that's four days worth of food.
-We always feed frozen food after rinsing it really well with salt water.
-Since our first algae problem ~6 months ago, when we discovered why tap water shouldn't be used, we have been using distilled water.
-We have PhosBan in our filter, which we change every time we change the carbon.

I don't mean to sound petulant or like we (by we, I mean my family) aren't listening to the advice given, but most of it doesn't seem to apply, because we already do what you are reccommending. We did move our smaller powerhead down so it blows across the sand, with no positive or negative results yet.