It sounds as though you are doing all the right things, but unless you are advised against it for some reason, dooshing with sterile saline solution may help more than you would imagine.
It requires some effort and patience to persuade the water to go to the right areas...leaning backwards off a chair -- holding nose and blowing. etc. GENTLY!
I have a bit of a thing about salt...mentioned it several times, but it does seem to be one of those natural remedies that make sense. Perhaps it stems from our evolutionary background.