You don't need to test and adjust your FC more than 3x day--Morning, mid-day, and after the sun passes in the evening. Morning and evening are the two most important tests.

Do we know your CYA/stabilizer level? If it's 100ppm or more, you need to maintain an FC level of 25 or more until the algae is completely dead.

Remember to run your filter 24/7, vacuum to waste, and brush the pool daily until you've won the battle.