Going to be blunt here: Stick to the program as written, or do a different program.
If you are going to do THIS program, Stop adding in extra work. Stop changing things around. Stop over analyzing it.
The program is written the way it is for a reason. It’s not designed to have 6th days added in. Its not designed to have you doing extra work for a body part 4 days a week. It’s not designed to have you doing super sets, drop sets, extra sets, etc…
If thats the kind of stuff you want to do, find a program that is built for that. This one isnt it.
In terms of lagging body parts and body parts that are too built, I think way too much is made of this idea. Honestly, how big are your FRONT DELTS that they are “too big”?? Has ANYONE ever said to you “Man, you’re front delts are way too big!” … No. They havent.
Having said that… Be smart with your exercise selection. Pick exercises that will hit ALL your body parts, and not neglect areas. If you are picking exercises that DONT hit your rear delts, thats bad. But doing NOTHING but Incline presses makes little sense, because once you have stimulated the “upper pec” (which is honestly quite controversial) there is no point in picking ANOTHER incline press variation unless you happen to like it, or feel it hits the muscles better than a flat variation.