Looks good!

first thing that came to mind when i saw the picture of the baby in dwc under 4 T5's with a room temp holding 65 - 70 degrees was, move the light down (or raise the plant, which looks ezer in your situation) closer to the plants! a good way to test is ether A) measure your temp at canopy height B) place the TOP of your hand directly under the light and move your hand up towards the light tell you feel alot of heat

Your Humidity is a little low, maybe you could place a dish (larger the surface area the better) in front of a fan...

On a side note, what are your first impressions of DWC? are you having pH fluctuations? How often are you doing res changes while you veg (do you go off TDS/EC readings or just change every other week or w/e)