sustanon's a weird blend... it does have some fast esters in it, but most of it is actually a long ester.
anyway, i'd suggest start the A-dex at .25 mg EOD. gyno and water retention aren't the only side effects of estrogen, and by the time you notice them, it's gonna take a while to get the AI built up in the body to address them.
that PCT is too much.
pick clomid or nolva, and use a normal dose (20 or 25 mg/day, respectively)