Chad, I did a similar thing, same similar experiences........ the next step was a real live planted tank with fish and shrimps.
The shrimps took a real beating, did not all die, but.....I would not suggets anyone do it with shrimp they do not care to lose.
Same result for myself and most folks I've spoken to, the product has very consistent results.
Which is rather surprising given the poor history of snake oil algae cure. But it's pretty limited to green hair algae.