Update: I lowered the lights to 30"-31" from the substrate last week. No algae issues. The increase CO2 has been making the plants grow a bit faster, I've been pruning. The hair grass is growing but not much thicker than the week before.
I just dropped it to 28"-29" from the substrate - I'm going to do a gradual 2-3" a week and watch. I've dropped the 4 bulb burst to 2 hours and 2 bulbs are on for 6 hours for a total of 8 hours photoperiod. Next week, I'll drop the light to 26" from the substrate and drop the 4 bulb burst to 1 hour so I don't over do the light.