Which is why you’re in the shape you’re in. So many of us are in the same boat, Kerry. Sports bras are an entire industry unto itself. I suspect you’ve checked this out but here goes anyway: http://www.health.com/breast-cancer/the-10-best-sports-bras-for-women-with-big-busts.
Bottom line, Kerry, you move, and often. That’s the biggest thing. Running just isn’t for everyone. Moving IS. Finding the way to move that works for our unique form is a lifetime process because it most definitely changes as we age. All I can say is bully for you for finding what works.