feel like the girls should be bigger?? sea of green

hi,

looking for some advice as to why these girls are so puny. let me explain the set up first

the set up

running a 600 w hps and have a fan hanging in the room
using a rubber maid 24 gal tote for the res and eight ( gallons of water
have 6 holes cut in the lid with net pots filled with hydroton.
using a 170 gph pump and two 1/4 jets per pot and also an airstone.

using GH nutes. running 1 tsp purple to 2 tsp pink per gallon of water.
running ph at 6.6-6.8, not sure on ppm as i dont have a meter. (was advised to use this mix and ph level by an experienced grower)

the plants

sour ak, kandy kush skunk, and sage

started from cuttings in rockwool
rooted for about 14 days and had nice roots coming out, and were transplanted to the tote for immediate flowering.

starting week 4 of flower, and the plants are flowering nicely, but all very small (4-6 inches), except for the sage, which is about 13-15 inches.

all the plants have very nice roots going all the way down to the bottom and floating in the res

so, who knows why they are so small?

i've seen other sea of green efforts where the plants are much bigger this far along into the process.

i've attatched some pics, so if you can see them well enough, please tell me what you think.

thanks for the help

Some strains dont stretch much when put straight into 12/12. Also the other sog you saw had clones cut at 9-12" which makes a difference when there is no ve g time. If you cant get big clones then have a 2 week veg period in the cycle.

I'm no hydro expert but the roots don't look like a plant 4 weeks into flowering. I grow soil and my roots are all over the place after a couple weeks of vegging. I get you didn't veg, I would expect a heartier root system at 4 weeks. I could be way off though seeing I know nothing about hydro. I wish you luck with the rest of your grow and hope you get better info than I can offer.

I was thinking same thing as Gother but same as him I know nothing of hydro. Hope some hydro experts can help you out bro.