already do the third world squat hold (http://www.T-Nation.com/free_online_article/sports_body_training_performance/the_thirdworld_squat)
as well as facing the wall squats, foam rolling (pvc pipe), mobility drills for t-spine, ankles and hips. Lower body training focused mostly around posterior chain movements. Advice appreciated
EDIT:
ADDED A SECOND FORM VIDEO (last two reps look any better?)