You know far more than me on that subject, however does aromasin would help??
Its a suicidal inhibitor, it destroy the enzyme responsible for conversion in estrogen( if I remember well). Does massive(25-50mg/daily) doses would allow you to be able to manage your E2. Aromasin to keep your aromatase at normal rate and arimidex to drop your E2.

Just saying...

Of course running 2 AI seems extreme but you situation is not common, so it needs uncommon solution.