I don't think that it's to much phlegm. It's more that what I'm coughing up is almost hard in consistency.
I don't know, but I would suggest stopping dairy as it cures a lot of people of too much phlegm. I don't mean you have to read labels, but change to a non-dairy type milk, like almond if you aren't allergic to that. Avoid regular ice cream, dairy yogurt, cheese cake, all the big obvious offenders, but don't worry about small amounts like Parmesan in food.
Drink mint tea. Eat vegetables and avoid sugar.
Please try this and report back after 3 weeks.