Bon - Have you considered adding guaifenesin (plain Mucinex 600mg LA) or NAC (Nacetyl cysteine 600mg twice a day) to help thin your mucus? I need to use BOTH to get anything up otherwise it stays stuck in my airways.
I probably only expectorate 1 tsp a day unless...I skip the saline for more than 2 days, it is allergy season, I have a cold or I am getting sick with a respiratory infection.

With that comes my reminder - I have been "stable" for 45 months, and have reached the point where I use my long-acting inhaler twice a day, do airway clearance every day, but only use saline every 2-3 days (3X/week) and only neb levalbuterol or other meds if I have a cold or exacerbation. When that happens I up saline to daily, airway clearance twice a day, and add the drugs if it doesn't begin to clear in 2 days.

So far this year I have only had ONE exacerbation - my personal best record in at least 10 years - even before I was diagnosed in 2018!

Remember, each of us is different. When I was (very) sick with MAC, I probably had 4 oz or more of mucus every day.
Sue