If you ever figure out the secret, let Arnold know since his biceps were two different shapes. Clearly he was training wrong.
But yeah, like Stu said, you build the muscle, get lean enough for definition, and you’ll look however you’re supposed to look. Maybe you end up with Ronnie Coleman peaks, maybe you end up with Sergio long bellies. Specific exercises aren’t going to influence that.
But really, at your height and weight, worrying about biceps peaks should be the last thing on your mind.