im no expert, but that sounds like a sufficient amount to me, if not a bit of overkill. as a referrence point, those emergen-c packets are about 1000 mg (1g) and they reccomend that dose about every two hours as needed, but as far as i am aware, there aren't any eminent risks from taking more than ones rda of vitamin c. other vitamins, yes, but this one can pretty much be had in abundance. anyone, feel free to comment/correct me.
interesting that your fat and sugar intake is not high. do you live in a cold climate, or in a scenario where you are cold then hot then cold then hot throughout the day? or possibly consume a more acidic diet?
i remember one of the early things i learned from researching ayurveda was a preparation for consuming dairy. the preparation was to gently heat it with the spices: ginger, cinnamon, and cardamom (then add a light amount of honey to take away any bitterness from the spice) to prevent the mucous and inflammation associated with dairy. i've experimented with this on my own and have found them invaluable in the prevention of excess mucous. as it stands i don't consume dairy but on very rare occasion, but the combo works quite well at any rate.
a sidenote: they can be used separately, but work best in conjunction with each other. i have found that even just sucking on a small portion of cinnamon, then nibbling on it till it's gone works pretty well in it's own right for mucous, especially after meals, but still doesn't compare to the trio.
edit: i just found this as well: "Parsley can help with expelling watery poisons, excess mucus,..." https://www.natmedtalk.com/showthread.php?t=5587
very watery vegetables can help thin the mucous too. things like celery, fennel, nappa cabbage, bok choy, etc. carrots do this as well, in conjunction with water, and so much so that they can even dry out the sinuses if one eats too many.