. I was also thinking about close-grip bench press and still am, so I’m open for suggestions.
I would wait until you are more comfortable with your flat benching. Particularly given it is typically a tricep movement...
The chin-up reps are only 1 because when going higher, the amount sets will become far too low. I always try to chin-up as cleanly as possible.
Well 5x3 is more total reps and better TUT so it will be progress. Keep that in mind.
When the 5x5 becomes harder, I’ve decided to change it to 3x5
Fine. Ramping up to a true 5RM is much much different than leaving enough in the tank for 17,900 straights sets of 5.
You don't need that much damn volume in the beginning IMO, and ramping (like everyone lifted weights before the internet) makes you stronger faster.
Maybe I’ll keep changing the assisting moves occasionally.
Good idea, just be sure to understand why you are changing, and if the lift you are swapping out helped you reach your goal before swapping.
I would say, 3-12 weeks will not be long enough to figure out if it is working or not. Maybe, if you are eating to gain, but I don't know for sure. Rough guess is I doubt it, but everyone and every muscle is different, so it is hard to say.
Is it all wrong or is there some good ideas behind it?
I'm a big fan of seeing you follow your gut a little bit. You are taking the cord principles from teh program and applying them how YOU feel they will best help YOU. You are going to learn how you respond pretty quickly.
Trail and error is a good teacher, and you will learn quick from your mistakes.