I am not super experienced and I have not gotten on cycle blood work, but here has been my experience:
I started with ~400 mg of testosterone cypionate injected twice a week. Since then, I have switched to ~550 (on paper) of testosterone enanthate a week injecting EOD. Throughout, I have used 1 mg of arimidex daily. I have not gotten any classic low estrogen symptoms nor have I gotten gyno or other high estrogen symptoms (pretty obvious from the dose). I can estimate from my libido, blood pressure, and changes in water retention early in the cycle that my net change in estrogen has been a decrease. If you are worried about your growth plates, start with a heavier dose like I did. If growth plates are not your concern, I would recommend budgeting 1 mg EOD or .5 mg EOD as a reasonable dose. Hope this helps.