On the topic of sterilizing, it depends. Pulmo/DNase and HTS should NOT be done in the same neb. Actually Pulmozyme is supposed to always get its own neb cup b/c its molecules are particularly susceptible to binding, and once it binds with another med (even residue, you're sacrificing efficiency and effectiveness. If you can't give it its own neb cup, then yes, you should be sterilizing in between.
I think it was Amy (Saveferris) who once described it as "pulmozyme doesn't play well with others" -- it's totally true.