Did you do any smashing while sitting on the floor or a box?
The floor is solid so there is no give like there is on the bed.
Smashing on the floor you have the weight of your leg on the ball vs doing it against a wall.
Are you using the bracing sequence? Pages 39-41 walk you through the sequence.
Braced neutral standing position pages 44-45
One place to start:
14-Day Mobility Challenge | 7 Green Lights | Day 1
14-Day Mobility Challenge | 7 Green Lights | Day 2
A couple to address hip flexion
Monday October 31, 2016 Hip Flexion
Thursday, November 10th, 2016 – Hip Flexion