Hi. I'm online and happy to answer your question today.
thank you for your excellent history. I have to admit, you are already doing everything possible to take care of your condition, with the exception of placement of punctal plugs.
I'm sorry to say that that only other advice I can offer to your current therapy would be to consult with a corneal/external disease specialist -- if you have not done so already.
At this point, I am sure that your ophthalmologist has done a very through examination and workup looking for all treatable or contributory issues that you may have. That being said, sometimes gathering up your medical records and having a new doctor, especially a cornea specialist, review your situation can shed new light on things.
Is there anything else you would like to discuss at this point or have all your questions been answered to your satisfaction?
I hope this information was helpful for you. But I do work for tips so I want to make sure you are happy with me before rating me. If you have another question on this or a related issue feel free to fire away. And please let me know if the rating system gives you any troubles. Thanks in advance, Dr. Rick