Why in the world would you need 6 different exercises for scapular retraction? Pick one.
Then realize that you still have to retract your scapula during the hammer high row as you scoop back and under and that you only need the 1 exercise to work scapular retraction and depression. Stretch your traps/levator/neck area prior to every set since overtight Traps I will make the shoulder want to hike.
If you need something additional, do dip shrugs for time (muscular endurance).
I suspct you have way more scsapular retraction strength than you need already anyhow, why do you need more?
A pulldown will also work on scapular depression as long as you do it right.
If you look at Sarah's back routine she does hi row and hammer BTN pulldown.
I don't see how incline bench shrug works serratus very well, it's more pec minor which is not what you need to be working on since tight pec minor tends to rotate the scapula up. Either do flat bench shrug/push up with a plus or front raises. A combo of benhc shrug/push up plus (for the protraction part of serratus) and front raise (for the posterior scapular tilting function of serratus) would make sense. Stretch midback (scapular retractors) prior to scap protraction work and stretch Traps/pec minor prior to the front raises.
So that's 4 exercises total. Hi row, pulldown (or dip shrug), scap protraction, scap posterior tilting.
To that you can add rear delts.
I'd do, at least, one horizontal and one vertical external rotation movement. Plates will provide the most resistance at the start/middle but almost none in the contracted position; cables will provide resistance in the contracted position. You could also do that scapular plane horizontla extension with your knee supported. You could do the cable PNF exercise to get a combo of rear delts, external rotation and Traps III/IV as well.
Internal rotation for subscap is fine.
Lyle