u/Pleaseclap4

I understand the premise of double progression just fine. If my program states a rep range of 3x 8-12, once I am able to hit 12 reps for all three sets, I'm to add weight - easy day. Where I'm confused is when RPE is factored into the equation. I've read you can either start at the bottom of the rep range and progress the sets from there, or start at the top of the rep range, and neither of these makes any sense due to the RPE requirement.

Using the example programming is 3 sets of 8-12, with an RPE of 8-10:

If I pick a weight which allows me to get an honest 8 reps on my first set, my second and third sets will be lower than 8 reps, so that doesn't seem to work.

If I pick a weight which allows me to get an honest 12 reps my first set, then the following week if my second set is 12 reps, that must mean my first set was more than 12, so that doesn't seem to work.

How can I possibly find myself hitting 12 reps on all three sets at the prescribed intensity?

https://imgur.com/a/4vrpER9

This is a ceiling patch, where years ago I removed a flush-mounted light fixture in favor of recessed fixtures. Above this ceiling is an insulated attic and basically what I did was cut a large square hole, then screwed a piece of sheetrock to close up the hole. I taped the 4 edges, applied mud, sanded and painted. As I recall, the sheetwork I screwed up was not flush with the existing ceiling, but rather inset 1/8 or maybe 3/16". What it looks like(to me) happened was that the mud did not adhere to the patch piece and separated, causing it to sag and crack. I'm wondering the best way to go about fixing this up so that the same problem doesn't happen again.

Thanks in advance!

I cannot for the life of me, wrap my head around double progression when factoring prescribed intensity?

How should I repair this?