I just finished cycle 28 which was a repeat of my TM from cycle 25. Even though I only own the first book I have been incorporating ideas from Beyond like 5 forward/3 back and the every sixth week deload. I also switch between BBB and FSL 5x5. On my press, BP & squat I was only able to get 2 reps on this last 1+ week. No real grinders but not exactly quick either. I feel I could go one or two more cycles before I couldn't make minimum reps on those lifts but I'm wondering if I wouldn't be better off resetting my TMs and adding in Jokers.
One weird thing I should mention is that even though I'm starting to struggle on the main 531 + sets I'm still killing my FSL work. For example, on BP night I got 2 reps at 290# but I had no problem getting 27 total reps of 230# all paused. My press and squat are very similar as far as the FSL sets go.