I think Drafting should work differently. It seems you can draft indefinitely as long as you know how to do it well.
Why not make drafted units have very low training and morale? If the center has 70 training, maybe make drafted troops only have 7~14 training?
I have not seen it used much myself, although I understand where you are coming from on this.
Your solution with its current numbers would not work though and to be honest I don't see any working where there is a damage to stats. Not because it wouldn't make people want to use it all the time, quite the opposite.
If you damage the stats during a draft it loses its purpose. The only time I think it would be used is in realms completely running out of recruits, if stats are damaged.