At <400mg/wk it should be sufficient... but at 3mL/wk - whatever concentration your gear may be, I'm certain is a good deal more than that, and you'd probably best invest in some Arimidex. You can pick up some high quality liquid Adex from HardcorePeptides.com - use ADREN20 for 20% OFF.
Lmk if you need any help... PM's are welcome