totally get it. I'm back on 531 now myself, biggest difference is that I'm running the BBB which I think is really important for my own progress. I do OK on the days that I skip it, but the BBB is definitely contributing to my squats fantastically. I'm somewhat with you in regards to numbers. My 44th is in mid Oct so I'd like to put a couple PR's on the board for that, but I'm not peaking for a 1rm effort. Right now I'm taking joker sets a little bit higher each week and hoping that one day, while in training, I just end up snagging a PR here and there. building the base, enjoying the marathon.
I get that way sometimes after overhead pressing if I don't warm up enough, almost like I slept on it funny. usually I ignore it and it goes away after a day but when its really bad I might pop a couple ibuprofen in the morning.