The first step is to prepare the mother for the process. It is important to ensure that the mother plant is healthy, in the vegetative stage of life, and that nitrogen levels are low. Ensure this by holding off fertilizing with anything at all for five or six days prior to the procedure and spraying her leaves with plain water the day before. By not fertilizing the plant you’re reducing the amount of nutrients stored in her leaves, and by spraying her with water, you’re leeching the immediately available nitrogen from her. If a clone has excess nitrogen stored in the leaves, it will use up its energy trying to continue to grow vegetation instead of developing roots.
Older, lower clones on the plant have less Nitrogen in them.
This is where you will get the biggest rate of success with your clones.
But personally...Just cut yourself a whole bunch extra.
If you want to keep 22, cut 30.
Keep the best looking ones and toss the rest.