Is there any reason why you are running a 9 hour photo period?
CO2 levels are about right. Do you start the CO2 30 before light on and stop 30 min after light off?
I think you can make a noticible dent in the algae by cutting back the light period to 7 hours without changing much else. If you were to troubleshoot this, change only 1 variable at a time and let the tank adjust over a few days to assess effectiveness.