Your regimen sounds great. You can also use warm castor oil in nostrils and ears, especially for kids. Before bed drop a few drops of castor oil in each ear and stick in a cotton ball in both ears. This worked for us, as children, my mom did this even if we did not have infection. In my family no child had ear infection.
You can add Lobeila and Mullein tinctures in your nebulizer mix. It works wonders.
Lastly for all in the family, before bed, must consume one teaspoon of turmeric powder with warm water. It works even better if you mix some black pepper and Ascorbic acid powder 1000mg.