IMHO the arimidex could be used at 0,25mg EOD or even E3D. It's important to control estrogen, but not get it too low. You need to evaluate the first time you use testosteron how much Adex you'll need. Too much will kill libido and limit gains.
@ 500mg Test E I'm fine with 0,25mg E3D.
@ 750mg Test E I need like 0,50 EOD.
Although this is personal. Start low and if your nips start to itch (not just sensitive, but itching etc)
Checking morning wood is my trick