Lauren, can you leave out the veil routine? I've never been in a competiton before so I don't know if that is an option. I know you want this so bad but in the long run and seeing the entire picture (your 14 classes) it may not be worth damaging your shoulder more. I'm such a worry wort. Can you tell?
You may end up permanently damaging your shoulder and that could effect the way you teach your classes.
If not, I'd second the cortisone shots.