Minimum dose (if you are going to use arimidex) I would ever suggest, no matter how low your A/S use is would be .5 mg ED or 1 mg EOD. You should be able to split the tabs in half.
Usually at 250 mg week of T you wont need it, but it cold be handy for lowering IGF1 levels while on fina and preventing stuff that way ... winny should help a lot too! Good combo!
NFG