Your lines are strong, and confident in their strokes and not sketchy which is great. I don't see anything wrong with these as gestures. They are using what looks like the Reilly method for a manikin build up so that might add to your work load for a 45 second pose.
Try just three lines and the head. Head, center rhythm, and both outside rhythms and that might help if you are trying to simplify more, if I'm understanding you correctly. You'll find that good dynamic poses have a simple side and a complex side.
The bottom row on the second picture is the closest to what I'm describing for simplicity and you already know how to do it. Get to where those take you 20 or 30 seconds and your fine.