My experience is that when mucus is green it's been in the lungs longer than the yellow mucus. I would want to get that green stuff up and out and not wait for it to come out on its own. As lungs age, elasticity diminishes so we need to assist our lungs with breath holds, huffs, postural drainage, etc to remove the mucus. Your naps and exercise are postural drainage it seems.

If it were I, I would increase airway clearance to 2x day with a bronchodilator followed by 7% saline. Add mucinex 1200mg twice a day. Personally I like the brand name better than the generic; the generic did not seem as effective, perhaps it has to do with the timed release aspect.

Like you I've had bronchiectasis for awhile (no MAC/etc working hard daily to keep it that way). Sadly, back then we did not have the communities of other bronchiectasis sufferers that we have today. There were months, maybe years when I had daily green mucus. I did know then what we know now. Pulmonary doctors rarely encountered bronchiectasis. Finally, a standard of care for bronchiectasis has emerged with airway clearance at the top of the list. When my mucus begins to turn darker I know to up the clearance.