I swapped over to aromasin/exemestane as I prefer the attributes and decreased side effects of a suicidal inhibitor but initially it was way too strong... took 25mg every 3rd day then backed off to 5th day and estro hit single digits. No libido and joint ache, etc.
So took a couple weeks off AIs entirely (no DIM either) and then had the pharm make 12.5mg caps...used one of those every 3-5 days and seemed to be great for a couple years then estro crept WAY up and even going to 12.5 twice to 3x a week really made minimal difference. Plus, the exem were costing $300 or so at the pharm (although that did last 3-4 months).
Swapped back to arimidex at 1mg twice a week (2 weeks) then cut back to 1/2mg 3x a week and finally cut test back (from 200 twice a week) to 90mg 3x a week and arimidex to 1/2mg twice weekly and seems to be much better balance and holding for a few months now.