Hi, I currently have 590cc ultra high profile round silicone implants. Would I need 200 or 300cc to see big difference?

I'm (5'3)  55kg including the implants in the progress of going down to around 52 kg. I've always had a big bum and big thighs so the 590cc are very well porportioned to my body. Although they are not as large as I expected and with clothes on they really do not look large at all. I love the big round fake look and I don't feel I achieved that with the 590s so I would like to upsize and wondering how many ccs I would have to get to make a very notifiable difference. Thanks :)