Are you pinning it? If so, then 500mg/wk is not much, but might do the job.
If taking orally or transdermally, then 500mg/day should be fine.
Why not just pin about 1400mg of 4-AD cyp per week, and take an aromatase inhibitor if you're afraid of bloat?
Next question: Why is everyone so afraid of bloat? You'll piss it away.