Do a set using a weight you can lift for 8-15 reps.
Then perform a set of lying (supine) front raises using a weight you can do for 8-15 reps.
The point of maximal mechanical tension when doing front raises is when your arm is parallel to the floor. So when doing the seated raises, the point of max tension is when your arms are perpendicular to your torso. With the lying front raises, the point of max tension is when your arms are parallel to your torso.
For several years, I was the Watson to Strength Coach Charles Poliquin's Sherlock Holmes. I chronicled his theories, revelations and discoveries. I like to think I played a small part in his success but in all probability, guys like Charles don't need any help; they get famous all on their own.