I think this implant is too big for you.

Of course, i haven't examined you. But it sounds from your description of your chest, that you would be overstuffing your breasts with 425cc implants. The problem is not that they will be pushed out to the side. It's that so much tension and weight in your tissues over time causes atrophy and deformities.

You want your breasts to look good for a long time. So consider a somewhat smaller size.

But there is nothing wrong with high profile implants. You actually see less rippling with them. And avoid tear drop shaped implants. They have a higher incidence of problems.

High profile implants have more projection than the other shaped implants of the same volume. I am not a big fan of tear drop shaped implants, because they can shift in position and look like footballs.