Kris,
It sounds like your infection is still there.
I strongly recommend that you check out the possibility to go and see Dr Oren Friedman at the Mayo Clinic.
They are very knowledgeable about atrophic rhinitis and ENS, and especially about acute chronic sinusitis such as yours.
They often recommend the topical irrigation of a liter of saline with80mg of gentimycin to fight the infection, and topical spray of premarin to improve the mucosa/squamous metaplasia.