The thing with hormones is you really can't pick and choose how they affect you.
I mean you could potentially go on a low dose of HRT and then severely restrict your protien and fat intake...because that's what boobs need to grow, but I really wouldn't recommend that course of actions because, well eating disorders aren't fun and whenever you give into the screaming cravings for fat and protien I would imagine that, just like I've found, it would all go straight on your boobs anyway essentially making the whole damn process pointless.
Can I just say again, this is not advice...i'm just trying to show how ultimately futile it would be to try and control changes that are just going to happen anyway.