I would like to prioritise chest and upper back, which is kind of why UL isn't just the obvious solution to me. If they're both on the same day, one has to come first, and that gets the most intensity/focus whether I like it or not. With the PPL program that I proposed, both get their own day.
Right now I get 12 sets of volume total for my upper back and chest per week. 1 exercise each per workout day, 4 sets of 6-8, when I can do 4x8 sets across, the weight jumps. By the end of my PPL program I would like the volume to progress to close to double that by the end of the mesocycle (which will last 4 weeks each). After that, take a week deload, and rinse and repeat until it's time to cut again.