Load heavy on snatch push press and overhead squat and do more reps at lighter weights w the snatch balance - weight that allows the athlete to receive low for 2-3 reps/set. Also high-hang and tall snatches (or block)
Likewise, load heavy on front squat, but do high-hang and tall cleans at weights that allow the athlete to get under to the depth you want.
Basically ingrain the movement of pulling down low and strengthen the receiving position so you're working it from both ends.
Check out my column in this month's performance menu
(issue 89) about this also.