Yeah I think it kind of is the left pec...but since feel perception/goals vs. actual results differs...
If you aim for left pec then lots of people will probably collapse the arm early and go to left upper arm. If you think right pec, and everything gets kind of collapsed slightly from the momentum you'll be at left pec. Everyone is a bit different with what the feel is perceived as and what clicks though.
Or you can just feel what that outer arc/hit point is, keep the angles maintained as much as possible during the backswing and forward swing, and then see on video after where it looked like the disc was near your chest. I think this is the best option.
Good advice. Thanks, so shoulder closed is the goal, which means you probably pull in towards left pec, but depending on how you get there it could be at left arm, or left pec, or right pec, but I'll experiment with where I hope to pull in to see where it actually lands.