First Grow-Please Help!!

This is my first grow. I am growing four plants in a megafarm converted into a DWC and two plants in soil.

The two plants in the front are Nirvana's Jock Horror. They are at day 24 of veg in these two pictures. The first picture is the first Jock Horror and it is about 5 1/2" tall with about 7 nodes. The second picture is the second plant and it is about 5 1/2" tall with about 6 nodes.

The two plants in the back are Nirvanas Durban Poison X Skunk #1 and they are at day 28 of veg. The first picture shows the first plant at about 8" tall and 8 nodes. The second picture shows the second plant at about 10 1/2" tall and 9 nodes.



The two potted plants are Skywalkers that are just being veged to be kept as mothers.

Shot of whole box:


This is my first grow so I am very new at this. Do my plants look healthy? I am kind of concerned at the way the first jock picture shows the leaves all drooping. Any suggestions?
I have about 38" total grow room before the plants are hitting the top of the 270w HPS, how tall should I let these get before switching to 12/12?

Thanks!!!