I got this sports bra for compression, and it works very well for me (I have D-something boobs, I don't know my actual bra size) and it reduces them a lot. https://www.amazon.com/dp/B01ES46RXW?ref=ppx_yo2ov_dt_b_product_details&th=1&psc=1

You might just have to wear like 2 sports bras at a time. Or maybe try a compression sports bra?