I already do the reps in the upper pics. I usually do twenty presses with the dumbbells parallel to the axis of my body, then twist them, so they are perpendicular to the long axis, and do five more.

But the exercise in the bottom pics look very helpful. I'll give those a try during my next workout.

Thanks again!

In essence, you want to push downward a bit, kind of like you are using a manual pump to inflate a tire.

At least that’s what I have read. Not really my focus so I don’t have experience to share

I had a pro body builder switch me to nothing but decline bench in my 50’s. Couldn’t believe how I grew and how they built up both lower and upper pecs.

and you've got a winner. Same as above, bench with your head on a decline, but do flyes rather than presses. Be sure to squeeze and hold at the peak. You can switch up the presses and flyes from the normal reps to negatives (eccentric reps), which emphasizes the lowering rather than the raising/pressing. Start with a lower weight than you use for presses if you're not used to this exercise.

looks something like this:

Not in honor of Chesty Puller, who was a Marine anyway. But because of what four solid years of daily pushups did for my chest. Plus, upper body strength is invaluable for a tanker.

I’d only add that if you have access to any adjustable cable/pulley apparatus, those can be beneficial for targeting specific areas.

Good luck, stay strong!