I was given the exact same size choices as you, 300 325 350 and honestly, I chose 350, I’m so glad I did because I don’t think they are big at all, I would of hated it if I chose less than 350 as the bra size I am now is a large C, im under the muscle too so it kinda knocks off a few CC’s anyway, so I stuck to 350 and no regrets at all xx