That def looks rootbound. I was having major issues with my ladies and it all seemed to fix it self once I transplanted. Mine looked almost identical to yours so it is something to look into.

TehNoobletimp:
t3hn00b137 Reviewed by t3hn00b137 on . someone help.. filled out form here and included pics.. 3rd timer and never a prob. What is your experience level? 3rd time Your Equipment: .1) Type and wattage of lights. 400W HPS .2) Distance from tops? 2.5 ft .3) Reflector type? enclosed reflector .4) Is there a consistent fresh air supply? yes .5) Do you have an exhaust fan and a circulation fan? yes .6) What are the bulb wattages, kelvin ratings, and schedule? 400W 18 on- 6 off Rating: 5