Have you already done this training?
Do you do something different?
Let's talk about it!
For me, that is too much arm and upper body work. When you are not the bigger guy, using arm strength to lift and drag the bigger guy is much harder to do. Yes, I see the knee bend.... but once you raise up, then go onto your toes, you use your arms to do the dragging.
I like to accomplish kuzushi using my feet. I use my arms as little as possible. The idea is to connect my weight to the other guy, then move my weight, such that the new center of balance breaks his posture.
If we start with a judo grip (sleeve and lapel) but with our feet square. (my feet are on my edge of the box, uke's feet are on his edge) The only thing I want to do with my arms, is keep them where they are in relation to my body. As in, my arms do not move at all. However, my arms do need to maintain a connection to uke. The weight of my arms hanging down, should provide that connection. When I move to get my kuzushi, my arms do not move... but they do maintain the connection to uke.
If my left hand has the sleeve... then I move my left foot back, about an inch. As a I set my weight back on my left heel, it brings uke forward a bit and starts a rotation... to my left, uke's right. Since I put my weight on my left, I am now free to bring my right foot across the front for which ever hip throw I want.
If I kept my arms from doing anything, then I kept uke's head and shoulders in front of me the entire time. The entire throw should feel like I am pushing him over my hip, not pulling him up and over.
When I want a bigger kusuzhi... from the same starting position... instead of stepping my left foot back... I can make a quarter turn to my left, and step forward with my left. Again, my arms do nothing, but maintain their frame. Here, since I stepped completely onto my left... I can step across with my right and complete the throw. Again, uke's head and shoulders stay in front of me the entire time.
These drills transition nicely into randori. When the other guy drives forward, you can step back with him, bringing him further than he intended... into your throw. Anytime the other guy has a foot off the mat, you can quarter turn towards the foot and step out... If he is retreating, you can step in with the quarter turn (variation of the second example above) and still get your kuzushi.
All of these involve using your footwork to create the kuzushi. Meaning, your feet did the work of moving your body weight, to effect the kuzushi. This works against guys way bigger and stronger than you, as you move with them and add to their movement... taking them a little further than they intended with a step. No over powering needed. Sure, there is a weight difference that is too much fore this method.... but it is a lot bigger difference than if you are using strength to lift and pull the guy.