KUSHBERRY Growing roots vs. leafs

hi every1,

Im workin 6 plants off of 2 bubbleponic systems. I have a 400w mh and 4 5500k 150w cfls surrounding the plants. All the plants besides my Kushberry are starting to develope their 5th set of leaves, while the kushberry is still trying to pur out its third set.

Before I transplanted all my babies, the kushberry was the shortest since the beginning, but its roots poked through the bottom of rockwool cube in 1 1/2 days!

I am wondering if it is possible that my Kushberry is not "stunted" in growth, but is just focusing on roots? Its tied for 1st for getting the most light, and it has its own bubblestone underneath, but it looks far behind the others.

Just tell me what ya think every1, here are some pics. (I'll show a pic of my Ice plant to show comparison.)
 

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