Last season we focused a little on one kihon-waza per month. That next to other kihon-waza and some different kata per grade level.
So one month tsuki-waza was trained, the next mae-geri-waza, then age-uke-waza and so on...
It worked out quite nice.
The extra attention on a waza help to fine-tune the different waza a bit better than usual.