Pairing the Right Accessories

It wouldn’t be due to the pairing of exercises but either because you are doing too much volume or pushing too hard on too many sets. You don’t need to kill yourself in the gym to make progress, I always find I do best when I still feel like I could do more at the end of my workout. If the overall objective is hypertrophy then maybe a bit more volume is better and more fatigue is acceptable, but not so much for strength unless you are able to recover from it and really do find that you make better progress that way.

I think you’re right. I use 5/3/1 to program my primary lifts and I think I’ve been pushing the plus sets too hard. I’ve been doing all of them to true failure (RPE 9.5–10) and I think I need to back off to leave 1-2 reps in the tank (RPE 8-9).