Bust darts

Mm my bust darts aren't looking too good. I did move them on the pattern to line up with the bust apex and the body/ waist ones look fine. But the under arm one ends funny and doesn't sit nice. Like a dimple. I had to shorten this one about an inch otherwise it would have ended right at the bust apex/ nipple and definitely would not have been a good look. What should I do to fix it? I am using a medium weight linen. Looking at the pattern again maybe I should lengthen it slightly so it ends in a similar place above the other dart. How close to the apex do I dare go?