I have the longer version of this binder and I'm a chubby guy who got lucky in the chest department. I've only got As to hide so I tried this binder to relieve some of the compression on my belly. Honestly I would not recommend it for you. There was a noticeable difference in my chest size with underworks vs this binder and i don't have nearly as much to compress as you do. I could still appear flat chested but the underworks binder did better. Generally speaking these binders work best for C cup or smaller, and even then I'd say only expect close to flat if you're an A or Small B. It also doesn't support well- if I jumped I could feel my chest bouncing. I can't even imagine how bad it would be for D or larger.
Long story short it's great for A/B and maybe C but any larger and it's not worth the money.