I can't comment on the Arimidex, but I am doing a similar cycle in a few months. I'm using Aromasin 12.5mg ED. I always use HCG throughout my cycle at 250iu's E3D until one week past my last test inject. The last week I jack up the HCG dose to 500iu's E3D. It may vary for you. You may want to do 500iu's E3D or 2x week. It depends on how your body reacts to your cycle.