Sounds like your getting it under control.
A blackout can work wonders though. When I had thread algae it took nearly a month to completely get rid of it.
Double, triple check your CO2. Move your drop checker around the tank and be sure your getting good flow.
After the blackout do a good water change and clean the filter.
Then assess your nutrients.
It takes time and patience.
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I mix my shrimp species and there ain't a damn thing you can do about it! 
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