It is normally for your plants to be a bit stressed after transferring them.
Signals that your plants have rooted include yellow leaf tips, roots growing out of drain holes, and vertical growth.
Also after transplanting photosynthesis and chlorophyll production are slowed, as are water and nutrient absorption via roots. Transplants need subdued light, so foliage can grow at the rate roots are able to supply water and nutrients.
Give new transplants filtered, less-intense light for a couple of days. If there is a fluorescent lamp handy, move your plants under it for a couple of days before moving them back under the HID.
Now that you have transplanted them;
you need low levels of nitrogen, iron, potassium and increased quantities of phosphorus. Any product containing Trichoderma bacteria or Vitamin B1 will help ease transplant shock. All you need to do is following the directions on the label. Your plants need a few days to settle in- and re-establish a solid flow of fluids from the roots throughout the plant.
Hope that helps...