Sounds good to me.

I'd stay on the 5mg methylB12 for a while yet. My normal B12 is 850 or so without supplements. I think you should beef up your liver storage and help get that B12 into the CSF with higher levels than you have. Another 3 months may do it, and if you pass 1000 you can coast then with say 5mg twice a week or 1mg daily if you want.

Pyroluria is treated with zinc and B6. It can also swing back and forth with "stress" being a trigger factor.
I seem to recall jcc over at gluten forum here discussing low IgA as common for gluten/celiac patients.
When her daughter was tested, she took her to a DAN doctor for the supplement supervision and dosing for safety's sake.
Some people just take zinc and B6 on their own.
OptiZinc is the one you would be best to use. It is easy on the stomach and well absorbed. Some zinc supplements cause nausea in some people.
I'll look up the Pyroluria sites for you later in the day.

Consider some kefir for your low IgA... it is lactose free. I only use 4 ounces a day, and it has really helped my GI issues tremendously --where yogurt seemed to do nothing.

Your low MCV shows that your B12 is working well. But it takes time for neuro things to resolve. The response to B12 in the bloodwork is faster than the neuro response. Many people don't have any anemia, but still have neuro symptoms. Your homocysteine is good ... you don't seem low in the B6, or that would be higher. But you may be low in zinc. You can have that tested too. A zinc/copper ratio is what is monitored in Pyroluria patients.

I think you should be relieved about your test results. They seem good so far, and reveal you are doing well.