Try adding 5 degrees at 1500 PPM CO2. Metabolic rate is directly proportional to heat until about 87 - 90f canopy depending on system used. Running too cool leaves yield on the table.
Drain to waste is not a system, merely denotes nutrients are not recycled, they hit roots once and trash.
The NFT or nutrient film means the tray always has a thin film running, thus its suited to DTW.
Flood n Drain fills tray much deeper periodically with dry spells between and uses more...
For an area larger than a light, I don't recommend 600's for overhead lighting, instead use 1kW lights for overhead and 600's are perfectly suited to vertical bare bulbs (fuckin trees!). A proper combo of both can be a massive producer.
@paparov bigger is better for your fans, just put them...