Everyone is different and may vary over time. After 2 years of xs sputum and an hour plus per day of postural drainage, a course of antibiotics cleared it all out and I’m back to 7% saline 1x daily and postural drainage occasionally
Over the six years of doing airway clearance, I’ve tried maybe ten different things, including vest, percussion, flutter, chest PT, breathing and drainage. And a lot of exercise!
Just keep trying things until something works for you, but be prepared to adjust if your situation changes.

Incidentally, my bronchiectasis expert doc told me 7% would be too irritating but I’ve been using it for years now with no problems except when I’m sick when I need to go down to 3%