It could take a little while longer. What is happening now is most if not all of the algae is dead so it needs to be filtered out of the water. You DO have to keep the FC up to make sure no zombie algae comes back!
Here are a couple of ideas to help speed things up:
-add DE to the sand in your filter. Here is a link to it:
Pool School - Add DE to a Sand Filter The DE box looks like this:
Shop Clorox PoolSpa 24-lb D E Pool Filter Aid at Lowes.com
-put an old t-shirt in the skimmer basket making sure there is plenty of water flow through it. This will also help catch some of the stuff.
Both ways will need you to be there watching until you learn how much DE your filter likes and if the water can flow through the shirt. If you have any friends with a pool see if they have any DE as you will never use all you buy in the box but they don't sell any smaller.
Kim