I assume the end tech means what the uchi-komi is. As in, for example with osoto gari, when you do the upper body lifting motion, step in with the reap without making contact, and going down the length of the mat with your partner.
If that action from the uchi komi is not enough kuzushi, then what are ways to make kuzushi before going into throw? If its just get opponent moving, then I assume the options are jacket tug-o-war, pushing contests, herky jerky, or the spinaroo ( Like the game we played as kids, in which you try and spin the other kid around your center line. You can actually get people to fall like that if you spin then fast enough)