Why are you going for 1 hour watering duration?

I use a different grow medium though. I have 6"x6" rockwool cubes sitting on a 1 1/2" coco matt. I am in flowering cycle right now. The root systems are pretty good sized. So I only flood the tray once a day just deep enough to cover the bottom of the cubes by about 3/4". THEN every 8 hours I flood the tray just deep enough to flood the COCO matt. When I was in Veg. I flooded every 8 hours to about 2 1/2" from the top of the cubes. which was about 7 minutes start to end. and then I slowly lowered the water level I flooded as the roots built lower in the cube. As it is now, I can raise the Coco matt up and see a nice root system laying below.

Good luck on your grow. Does not look even close to how bad mine looked not to long ago.